Question

if cos 2a = sin (A-15) find A​

Answer 1

hope it helps you..........

Answer 2

Cos2a = Sin(a-15)

= Sin(90-2a) = Sin(a-15) . [Since,CosQ = Sin(90-Q)]

= 90-2a = a-15

= 90+15 = a+2a

= 3a = 105

= Hence, a = 35.

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