dy Solve = tan y cot x sec y cos x, simple dx substitution [Hint: Express the functions first in terms of sine and cosine.] A B C D sin x sin y sin x sin y sin x sin y sin y sin x =ce =ce = ce =ce 4 1 -1 4 cos 2x 4 -1 cos 2x 4 cos 2y cos 2x

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