Question

1Sin (90°-A) and Cos A are!
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Answer 1

Answer:

Step-by-step explanation:

sin (A – B) = sin A.cos B – sin B.cos A

Hence substituting A= 90 and B= A in the above identity. We get

sin (90 – A) = sin 90.cos A – sin A cos 90.

We have learnt that sin 90 = 1, And cos 90 = 0

sin (90 – A) = cos A