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شائع علم المثلثات >

sin(165)cos(45)

الحلّ

sin (16 5^{\circ}) cos (4 5^{\circ})

الحلّ

\frac{3 - 1}{4}

عشري

0.18301 \dots

خطوات الحلّ

sin (16 5^{\circ}) cos (4 5^{\circ})

Rewrite using trig identities:

sin (16 5^{\circ}) = \frac{6 - 2}{4}

sin (16 5^{\circ})

Rewrite using trig identities:

sin (13 5^{\circ}) cos (3 0^{\circ}) + cos (13 5^{\circ}) sin (3 0^{\circ})

sin (16 5^{\circ})

sin (13 5^{\circ} + 3 0^{\circ})

كـ

sin (16 5^{\circ})

أكتب

= sin (13 5^{\circ} + 3 0^{\circ})

sin (s + t) = sin (s) cos (t) + cos (s) sin (t)

:فعّل متطابقة الجمع لزوايا

= sin (13 5^{\circ}) cos (3 0^{\circ}) + cos (13 5^{\circ}) sin (3 0^{\circ})

= sin (13 5^{\circ}) cos (3 0^{\circ}) + cos (13 5^{\circ}) sin (3 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

sin (13 5^{\circ}) = \frac{2}{2}

sin (13 5^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{2}{2}

استخدم المتطابقة الأساسيّة التالية:

cos (3 0^{\circ}) = \frac{3}{2}

cos (3 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{3}{2}

استخدم المتطابقة الأساسيّة التالية:

cos (13 5^{\circ}) = - \frac{2}{2}

cos (13 5^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= - \frac{2}{2}

استخدم المتطابقة الأساسيّة التالية:

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 0^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{1}{2}

= \frac{2}{2} \cdot \frac{3}{2} + (- \frac{2}{2}) \frac{1}{2}

\frac{2}{2} \cdot \frac{3}{2} + (- \frac{2}{2}) \frac{1}{2}

بسّط:

\frac{6 - 2}{4}

\frac{2}{2} \cdot \frac{3}{2} + (- \frac{2}{2}) \frac{1}{2}

(- a) = - a

:احذف الأقواس

= \frac{2}{2} \cdot \frac{3}{2} - \frac{2}{2} \cdot \frac{1}{2}

\frac{2}{2} \cdot \frac{3}{2} = \frac{6}{4}

\frac{2}{2} \cdot \frac{3}{2}

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

:اضرب كسور

= \frac{2 3}{2 \cdot 2}

2 \cdot 2 = 4 :

اضرب الأعداد

= \frac{2 3}{4}

23

بسّط:

6

23

a b = a \cdot b

:فعْل قانون الجذور

23 = 2 \cdot 3

= 2 \cdot 3

2 \cdot 3 = 6 :

اضرب الأعداد

= 6

= \frac{6}{4}

\frac{2}{2} \cdot \frac{1}{2} = \frac{2}{4}

\frac{2}{2} \cdot \frac{1}{2}

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

:اضرب كسور

= \frac{2 \cdot 1}{2 \cdot 2}

2 \cdot 1 = 2 :

اضرب

= \frac{2}{2 \cdot 2}

2 \cdot 2 = 4 :

اضرب الأعداد

= \frac{2}{4}

= \frac{6}{4} - \frac{2}{4}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

فعّل القانون

= \frac{6 - 2}{4}

= \frac{6 - 2}{4}

استخدم المتطابقة الأساسيّة التالية:

cos (4 5^{\circ}) = \frac{2}{2}

cos (4 5^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{2}{2}

= \frac{6 - 2}{4} \cdot \frac{2}{2}

\frac{6 - 2}{4} \cdot \frac{2}{2}

بسّط:

\frac{3 - 1}{4}

\frac{6 - 2}{4} \cdot \frac{2}{2}

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

:اضرب كسور

= \frac{( 6 - 2 ) 2}{4 \cdot 2}

4 \cdot 2 = 8 :

اضرب الأعداد

= \frac{2 ( 6 - 2 )}{8}

8

حلل إلى عوامل:

2^{3}

8 = 2^{3}

حلّل إلى عوامل

= \frac{2 ( 6 - 2 )}{2 ^{3}}

\frac{( 6 - 2 ) 2}{2 ^{3}}

اختزل:

\frac{6 - 2}{2 ^{\frac{5}{2}}}

\frac{( 6 - 2 ) 2}{2 ^{3}}

n a = a^{\frac{1}{n}}

:فعْل قانون الجذور

2 = 2^{\frac{1}{2}}

= \frac{2 ^{\frac{1}{2}} ( 6 - 2 )}{2 ^{3}}

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

:فعّل قانون القوى

\frac{2 ^{\frac{1}{2}}}{2 ^{3}} = \frac{1}{2 ^{3 - \frac{1}{2}}}

= \frac{6 - 2}{2 ^{3 - \frac{1}{2}}}

3 - \frac{1}{2} = \frac{5}{2} :

اطرح الأعداد

= \frac{6 - 2}{2 ^{\frac{5}{2}}}

= \frac{6 - 2}{2 ^{\frac{5}{2}}}

2^{\frac{5}{2}} = 2^{2} 2

2^{\frac{5}{2}}

2^{\frac{5}{2}} = 2^{2 + \frac{1}{2}}

= 2^{2 + \frac{1}{2}}

x^{a + b} = x^{a} x^{b}

:فعّل قانون القوى

= 2^{2} \cdot 2^{\frac{1}{2}}

بسّط

= 2^{2} 2

= \frac{6 - 2}{2 ^{2} 2}

2^{2} = 4

= \frac{6 - 2}{4 2}

\frac{6 - 2}{4 2}

حوّل لصيغة عدد كسريّ:

\frac{3 - 1}{4}

\frac{6 - 2}{4 2}

\frac{2}{2}

اضرب بالمرافق

= \frac{( 6 - 2 ) 2}{4 2 2}

(6 - 2) 2 = 23 - 2

(6 - 2) 2

= 2 (6 - 2)

a (b - c) = ab - a c

: افتح أقواس بالاستعانة بـ

a = 2, b = 6, c = 2

= 26 - 22

26 - 22

بسّط:

23 - 2

26 - 22

26 = 23

26

6 = 2 \cdot 3 :

حلّل العدد لعوامله الأوّليّة

= 2 2 \cdot 3

n ab = n a n b

:فعْل قانون الجذور

2 \cdot 3 = 23

= 223

a a = a

:فعْل قانون الجذور

22 = 2

= 23

22 = 2

22

a a = a

:فعْل قانون الجذور

22 = 2

= 2

= 23 - 2

= 23 - 2

422 = 8

422

a a = a

:فعْل قانون الجذور

22 = 2

= 4 \cdot 2

4 \cdot 2 = 8 :

اضرب الأعداد

= 8

= \frac{2 3 - 2}{8}

23 - 2

حلل إلى عوامل:

2 (3 - 1)

23 - 2

أعد الكتابة كـ

= 23 - 2 \cdot 1

2

قم باخراج العامل المشترك

= 2 (3 - 1)

= \frac{2 ( 3 - 1 )}{8}

2 :

إلغ العوامل المشتركة

= \frac{3 - 1}{4}

= \frac{3 - 1}{4}

= \frac{3 - 1}{4}

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