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10-12-2017
Mathematics

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Simplify the expression by using a double-angle formula or a half-angle formula. (a) cos2 θ 2 − sin2 θ 2

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10-12-2017

If this is supposed to be
[tex]cos^{2}θ-sin^{2}θ[/tex]
Then this can simply be reduced to
[tex]cos2θ[/tex]
by the double angle formula for cosine

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