Express sin theta in terms of sec theta.

We know that,

sin2 θ = 1 - cos2 θ

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Sin^2 theta = 1 - Cos^2 theta

so, sin theta = root of cos^2 theta

and since cos^2 theta = 1 / sec^2 theta

Sin theta = root of 1 - 1/sec^2 theta.

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