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10 January, 04:10

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

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  1. 10 January, 04:18
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    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
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