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شائع علم المثلثات >

cos(w)=0.75sin(90-w)

الحلّ

cos (w) = 0.75 sin (9 0^{\circ} - w)

الحلّ

w = 9 0^{\circ} + 36 0^{\circ} n, w = 27 0^{\circ} + 36 0^{\circ} n

راديان

w = \frac{π}{2} + 2 πn, w = \frac{3 π}{2} + 2 πn

خطوات الحلّ

cos (w) = 0.75 sin (9 0^{\circ} - w)

Rewrite using trig identities

cos (w) = 0.75 sin (9 0^{\circ} - w)

Rewrite using trig identities

sin (9 0^{\circ} - w)

sin (s - t) = sin (s) cos (t) - cos (s) sin (t)

:فعّل متطابقة الطرح لزوايا

= sin (9 0^{\circ}) cos (w) - cos (9 0^{\circ}) sin (w)

sin (9 0^{\circ}) cos (w) - cos (9 0^{\circ}) sin (w)

بسّط:

cos (w)

sin (9 0^{\circ}) cos (w) - cos (9 0^{\circ}) sin (w)

sin (9 0^{\circ}) cos (w) = cos (w)

sin (9 0^{\circ}) cos (w)

sin (9 0^{\circ})

بسّط:

1

sin (9 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

sin (9 0^{\circ}) = 1

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}

= 1

= 1 \cdot cos (w)

1 \cdot cos (w) = cos (w) :

اضرب

= cos (w)

cos (9 0^{\circ}) sin (w) = 0

cos (9 0^{\circ}) sin (w)

cos (9 0^{\circ})

بسّط:

0

cos (9 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

cos (9 0^{\circ}) = 0

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}

= 0

= 0 \cdot sin (w)

0 \cdot a = 0

فعّل القانون

= 0

= cos (w) - 0

cos (w) - 0 = cos (w)

= cos (w)

= cos (w)

cos (w) = 0.75 cos (w)

cos (w) = 0.75 cos (w)

من الطرفين

0.75 cos (w)

اطرح

0.25 cos (w) = 0

100

اضرب الطرفين بـ

0.25 cos (w) = 0

To eliminate decimal points, multiply by 10 for every digit after the decimal pointThere are

2

digits to the right of the decimal point, therefore multiply by

100

0.25 cos (w) \cdot 100 = 0 \cdot 100

بسّط

25 cos (w) = 0

25 cos (w) = 0

25

اقسم الطرفين على

25 cos (w) = 0

25

اقسم الطرفين على

\frac{25 cos ( w )}{25} = \frac{0}{25}

بسّط

cos (w) = 0

cos (w) = 0

cos (w) = 0 :

حلول عامّة لـ

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}

w = 9 0^{\circ} + 36 0^{\circ} n, w = 27 0^{\circ} + 36 0^{\circ} n

w = 9 0^{\circ} + 36 0^{\circ} n, w = 27 0^{\circ} + 36 0^{\circ} n

رسم

أمثلة شائعة

csc(4x)=2

csc (4 x) = 2

3tan^2(x)=2sec^2(x)+1,0<= x<= 180

3 tan^{2} (x) = 2 sec^{2} (x) + 1, 0^{\circ} \leq x \leq 18 0^{\circ}

solvefor x,2cos(x)-sqrt(2)=0

so l v e f or x, 2 cos (x) - 2 = 0

cos(x)=(2.16)/(3.42)

cos (x) = \frac{2.16}{3.42}

sinh(x)= 5/12 ,cosh(x)

sinh (x) = \frac{5}{12}, cosh (x)