Question

If tan A = 3/4 , then cos 2 A = ?​

Answer 1

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tan A = 3/4

=> sinA/cosA = 3/4

Therefore, cos A = 4

So,

cos^2A = 4^2 = 16

$\boxed{Hope\:This\:Helps}$

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Answer 2

Step-by-step explanation:

ur question was not fully correct

........

TanA = 3/4

we know

tanA = opposite side/adjacent side

so opposite side = 3

adjacent side = 4

then tangent becomes 5

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cos²A - sin²A

= (4/5)²-(3/5)²

= 16/25 - 9/25

= 16-9/25

= 7/25