Question

if sin thita =2/5 find the value of cos2 thita
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Answer 1

Answer:

sinθ =$\frac{2}{5}$

cos2θ$=1-2sin^{2}$ θ

=1-2$(\frac{2}{5} )^{2}$

=1-8/5

=5-8/5

=-3/5

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