Math, asked by SoundaryaaKC, 11 months ago

if Sin a=3/5,then cos2a=

Answers

Answered by benhurmuthu

1

Step-by-step explanation:

sin a=3/5

square on both sides

sin²a=9/25

1-cos²a=9/25

1-9/25=cos²a

16/25=cos²a

cos a=4/5

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