Question

cos(π/2-x) = sinx ..........prove that......

Answer 1

Hey dear !!!!

We know that ,

cos ( A - B ) = cosA cosB + sinA sinB

similarly

cos ( π/2 - x ) = cos90° cosx° + sin90° sinx°

but , cos90° = 0

and sin90° = 1

so,

cos ( π/2 - x )

or, cos ( 90° - x ) = 0 + sinx

since, prooved cos ( 90° - x )= sinx

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Hope it helps you !!!


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Answer 2

Step-by-step explanation:

The above person has answered very well....just follow him....

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