Question

Value of costheta in terms of sintheta

Answer 1

cos square theta =1-sin square theta
cos theta =+/-√1-sin square theta

Answer 2

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$<b>★★cos2θ + sin2θ = 1, so cos2θ = 1 - sin2θ Therefore, cosθ = ±√(1-sin2θ)$★★
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