Question

Sin a=3/5,and a+b=90,then the value of Cos b is​

Answer 1

Answer:

4/5

Step-by-step explanation:

Formula of maths- sin2a +cos2a=1

sina=√cos2a=4/5

Answer 2

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Given,

a + b = 90

a = 90 - b

We know,

sin ( 90 - ¤ ) = cos ¤

So, sin a = 3 / 5

sin ( 90 - b) = 3 / 5

cos b = 3 / 5

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