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# Trig identities help watch

1. (sin^2 theta) / (1+cos theta) = 1 - cos theta

Solution would be appreciated.
Have a good day.
2. (Original post by STUDENTGCSE2017)
(sin^2 theta) / (1+cos theta) = 1 - cos theta

Solution would be appreciated.
Have a good day.
Express in terms of and then express THAT as a difference of two squares.
3. sin^2 θ / 1 + cos θ = 1 - cos θ

Thus, sin^2 θ = (1 + cos θ)(1 - cos θ) = 1 - cos^2 θ
So, 1 = sin^2 θ + cos^2 θ which is a constant trigonometric identity and thus proves the first equation.

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Updated: February 6, 2018
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