# If sin x= 4/5, how do you find cos x?

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Mar 1, 2018

cosx= $\frac{3}{5}$

Use Trignometrical identity cosx = $\sqrt{1 - {\sin}^{2} x}$

cos x = $\sqrt{1 - \frac{16}{25}}$ =$\sqrt{\frac{9}{25}}$ = $\frac{3}{5}$ to be the value in the first quadranr.

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