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Given $\sin\theta = 1$. Find $\cos(2\theta)$. 

          Given $\sin\theta = 1$. Find $\cos(2\theta)$.
Given sinθ = 1. Find cos(2θ).

Added by Matthew M.

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Precalculus with Limits
Precalculus with Limits
Ron Larson 2nd Edition
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Given sin heta =1. Find cos(2 heta ). Answel
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Transcript

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00:01 There is a question in this i need to find the value of theta that is i need to solve sin theta equal to cos 2 theta plus 30 degree.
00:13 So, i will be using the cofunction identity as sin x equal to cos 90 degrees minus x.
00:22 This case sin theta will be equal to cos or simply one more thing that cos theta or cos x equal to sin 90 degrees minus x.
00:48 Sin 90 degree minus 2 theta plus 30 degree.
00:56 Sin theta will be equal to sin 90 degree and minus 30 degree 60 degree minus 2 theta...
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