## anonymous one year ago Verify the identity. sin quantity x plus pi divided by two = cos x

1. IrishBoy123

$$\sin(x +\frac{\pi}{2}) = \cos x$$

2. anonymous

alright would it be easier if I try to verify the left side.

3. IrishBoy123

yes you can expand out $$\sin(A+B) = \sin A \cos B + \sin B \cos A$$

4. IrishBoy123

what are you actually studying? you could draw and look for a geometric proof

5. IrishBoy123

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