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شائع الجبر >

expand cot(1/2 (x+y))cot(1/2 (x-y))

الحلّ

expand

cot (\frac{1}{2} (x + y)) cot (\frac{1}{2} (x - y))

الحلّ

cot (\frac{x + y}{2}) cot (\frac{x - y}{2})

خطوات الحلّ

cot (\frac{1}{2} (x + y)) cot (\frac{1}{2} (x - y))

\frac{1}{2} (x + y)

وسٌع:

\frac{1}{2} x + \frac{1}{2} y

= cot (\frac{1}{2} (x - y)) cot (\frac{1}{2} x + \frac{1}{2} y)

\frac{1}{2} (x - y)

وسٌع:

\frac{1}{2} x - \frac{1}{2} y

= cot (\frac{1}{2} x + \frac{1}{2} y) cot (\frac{1}{2} x - \frac{1}{2} y)

Rewrite using trig identities

= \frac{cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) - sin ( \frac{x}{2} ) sin ( \frac{y}{2} )}{sin ( \frac{x}{2} ) cos ( \frac{y}{2} ) + cos ( \frac{x}{2} ) sin ( \frac{y}{2} )} cot (\frac{1}{2} x - \frac{1}{2} y)

Rewrite using trig identities

= \frac{cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) - sin ( \frac{x}{2} ) sin ( \frac{y}{2} )}{sin ( \frac{x}{2} ) cos ( \frac{y}{2} ) + cos ( \frac{x}{2} ) sin ( \frac{y}{2} )} \cdot \frac{cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) + sin ( \frac{x}{2} ) sin ( \frac{y}{2} )}{sin ( \frac{x}{2} ) cos ( \frac{y}{2} ) - cos ( \frac{x}{2} ) sin ( \frac{y}{2} )}

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

:اضرب كسور

= \frac{( cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) - sin ( \frac{x}{2} ) sin ( \frac{y}{2} ) ) ( cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) + sin ( \frac{x}{2} ) sin ( \frac{y}{2} ) )}{( sin ( \frac{x}{2} ) cos ( \frac{y}{2} ) + cos ( \frac{x}{2} ) sin ( \frac{y}{2} ) ) ( sin ( \frac{x}{2} ) cos ( \frac{y}{2} ) - cos ( \frac{x}{2} ) sin ( \frac{y}{2} ) )}

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

:فعّل متطابقة الجمع لزوايا

= \frac{( cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) - sin ( \frac{x}{2} ) sin ( \frac{y}{2} ) ) ( cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) + sin ( \frac{x}{2} ) sin ( \frac{y}{2} ) )}{sin ( \frac{x}{2} + \frac{y}{2} ) ( sin ( \frac{x}{2} ) cos ( \frac{y}{2} ) - cos ( \frac{x}{2} ) sin ( \frac{y}{2} ) )}

sin (\frac{x}{2} + \frac{y}{2}) (sin (\frac{x}{2}) cos (\frac{y}{2}) - cos (\frac{x}{2}) sin (\frac{y}{2}))

بسّط:

sin (\frac{x}{2} + \frac{y}{2}) sin (\frac{x}{2} - \frac{y}{2})

= \frac{( cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) - sin ( \frac{x}{2} ) sin ( \frac{y}{2} ) ) ( cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) + sin ( \frac{x}{2} ) sin ( \frac{y}{2} ) )}{sin ( \frac{x}{2} + \frac{y}{2} ) sin ( \frac{x}{2} - \frac{y}{2} )}

(cos (\frac{x}{2}) cos (\frac{y}{2}) - sin (\frac{x}{2}) sin (\frac{y}{2})) (cos (\frac{x}{2}) cos (\frac{y}{2}) + sin (\frac{x}{2}) sin (\frac{y}{2}))

بسّط:

cos (\frac{x}{2} + \frac{y}{2}) (cos (\frac{x}{2}) cos (\frac{y}{2}) + sin (\frac{x}{2}) sin (\frac{y}{2}))

= \frac{cos ( \frac{x}{2} + \frac{y}{2} ) ( cos ( \frac{x}{2} ) cos ( \frac{y}{2} ) + sin ( \frac{x}{2} ) sin ( \frac{y}{2} ) )}{sin ( \frac{x}{2} + \frac{y}{2} ) sin ( \frac{x}{2} - \frac{y}{2} )}

cos (\frac{x}{2}) cos (\frac{y}{2}) + sin (\frac{x}{2}) sin (\frac{y}{2})

بسّط:

cos (\frac{x}{2} - \frac{y}{2})

= \frac{cos ( \frac{x}{2} + \frac{y}{2} ) cos ( \frac{x}{2} - \frac{y}{2} )}{sin ( \frac{x}{2} + \frac{y}{2} ) sin ( \frac{x}{2} - \frac{y}{2} )}

\frac{x}{2} - \frac{y}{2}

وحّد الكسور:

\frac{x - y}{2}

= \frac{cos ( \frac{x}{2} + \frac{y}{2} ) cos ( \frac{x}{2} - \frac{y}{2} )}{sin ( \frac{x - y}{2} ) sin ( \frac{x}{2} + \frac{y}{2} )}

\frac{x}{2} + \frac{y}{2}

وحّد الكسور:

\frac{x + y}{2}

= \frac{cos ( \frac{x}{2} + \frac{y}{2} ) cos ( \frac{x}{2} - \frac{y}{2} )}{sin ( \frac{x + y}{2} ) sin ( \frac{x - y}{2} )}

\frac{x}{2} - \frac{y}{2}

وحّد الكسور:

\frac{x - y}{2}

= \frac{cos ( \frac{x - y}{2} ) cos ( \frac{x}{2} + \frac{y}{2} )}{sin ( \frac{x + y}{2} ) sin ( \frac{x - y}{2} )}

\frac{x}{2} + \frac{y}{2}

وحّد الكسور:

\frac{x + y}{2}

= \frac{cos ( \frac{x + y}{2} ) cos ( \frac{x - y}{2} )}{sin ( \frac{x + y}{2} ) sin ( \frac{x - y}{2} )}

\frac{cos ( x )}{sin ( x )} = cot (x)

:Use the basic trigonometric identity

= cot (\frac{x + y}{2}) cot (\frac{x - y}{2})

أمثلة شائعة

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