Question

if tanA =3/4 then cos2A=?

Answer 1

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Answer 2

$\cos2a \\ \frac{1 - \tan ^{2} a }{1 + \tan ^{2}a} \\ \frac{1 - ( \frac{3}{4})^{2} }{1 + ( \frac{3}{4})^{2} } \\ \frac{1 - \frac{9}{16} }{1 + \frac{9}{16} } \\ \frac{7}{25}$
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