If cosA=2/5, find the value of 4+4 tan^2A

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asked Jun 18, 2018 144k views

2 Answers

Harsha Bhat · Answer 1 · 2018-06-23T17:39:04+0000

The first equation is given to determine A.

cos A = 2/5
A = cos⁻¹(2/5) = 66.42°

Now that we know A, we use this value to the second equation.

4 + 4tan²A = 4 +24.996 4tan²(66.42°) = 24.996 ≈ 25

If cosA=2/5, find the value of 4+4 tan^2A

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