Q. 255.0( 4 Votes )

If cos B = 3/5 and (A + B) = 90°, find the value of sin A.

Answer :

We are given that: cos B = 3/5


sin (90° – B) = 3/5


Since A + B = 90°, therefore A = 90° – B


Therefore, sin (90° – B) = sin A = 3/5


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