Question

find the value of cosA cos(90°-A)-sinA sin(90°-A)

Answer 1

Hope it helps?!!!!!!!!!!!

Answer 2

The value of given expression is 0.

Step-by-step explanation:

The given expression is

$\cos A \cos (90^{\circ}-A)-\sin A \sin(90^{\circ}-A)$

We need to find the value of given expression.

We know that

$\cos (90^{\circ}-\theta)=\sin \theta$

$\sin (90^{\circ}-\theta)=\cos \theta$

Using these formulas the given expression can be written as

$\cos A \sin A-\sin A \cos A$

$0$

Therefore, the value of given expression is 0.

#Learn more

Evaluate:

sina cosa - (sina cos(90-a)cosa/sec(90 -a)) - (cosa sin(90-a)sina/cosec(90-a))

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