= sin^2 θ-2sinθcosθ-cos^2 θ
is this all?? what else can i do?
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Not sure what you are trying to do but
Originally Posted by somanyquestions (sinθ-cosθ)^2
= sin^2 θ-2sinθcosθ+cos^2 θ
is this all?? what else can i do? two identities involved here ...
(1) the basic Pythagorean identity ...
(2) the double angle identity for sine ...
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