Question Doubleangle identities Problem type 1 Find sin 2x, cos 2x, and tan 2x if cosx= VIO and r terminates in quadrant II 10 0 0/6 sin 2x Х 5 ? $$\frac{1}{\tan (x)(1\cos(2x))} = \csc(2x)$$ I really don't know what to do with denominator Sure, I can use the double angle formula for cosine, and get $$\frac{1These identities are useful whenever expressions involving trigonometric functions need to be simplified An important application is the integration of nontrigonometric functions a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity
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