Math, asked by vaishu4399, 1 year ago

If cos2a =sin(a-15) find a

Answers

Answered by Chanakya007

0

Cos( a)=Sin(90-a)

Cos(2a)=Sin(90-2a)

Sin(a-15)=Sin(90-2a)

a-15=90-2a

a+2a=90+15

3a=105

a=35

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