Question

If sin A = 3/4 find CosA

Answer 1

cosA=√7/4 is the answer.

Answer 2

$\cos(a) = \sqrt{1 - { \sin(a) }^{2} }$
$\cos(a) = \sqrt{1 - ( { \frac{3}{4} ) }^{2} }$
$\cos(a) = \sqrt{1 - \frac{9}{16} }$
$\cos(a) = \sqrt{ \frac {16 - 9}{16}}$
$\cos(a) = \sqrt{ \frac{7}{16} }$

$\cos(a) = \frac{ \sqrt{7} }{4}$

So Cos(a) = √7/4

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