amiroskolaee amiroskolaee

03-12-2020
Mathematics

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I need to find the identity of this equation for pre calc

I need to find the identity of this equation for pre calc class=

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LammettHash LammettHash

03-12-2020

Expand the left side using the angle sum identity for sine:

sin(x + π/2) = sin(x) cos(π/2) + cos(x) sin(π/2)

cos(π/2) = 0 and sin(π/2) = 1, so the right side reduces to

sin(x + π/2) = cos(x)

as required.

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