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If sin^2 x + cos^2 y = 1, what is dy/dx?
A-sin 2x / sin 2y
Bsin 2y / sin 2x
Csin 2x / sin 2y
Dtan x / tan y
Answer & Solution
Correct answer: C. sin 2x / sin 2y
Differentiating gives 2 sin x cos x - 2 cos y sin y y' = 0, so y' = sin 2x / sin 2y.
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