Question

if sin square tita =1upon2then find cos square thetha
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Answer 1

$\sin^2 \theta=\dfrac{1}{2}\\\\\cos^2 \theta=?\\\\\sin^2\theta+\cos^2\theta=1\\\\\dfrac{1}{2}+\cos^2\theta=1\\\\\cos^2\theta=\dfrac{1}{2}$