Math, asked by kshlsandhu, 1 year ago

secA-tanA=4,then prove that cosA=8/17

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Answered by sahil573

6

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Answered by mukuladhikari0123

0

SecA-TanA=4

(-tanA)²=(4-secA)²

-(secA+tanA)²=16-8secA

-1=16-8secA

-17=8secA

CosA=8/17

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