1.

Find the derivative of Tan(x) = Tan(y).

A. ( frac{1+x^2}{1+y^2} )
B. ( frac{1+y}{1+x^2} )
C. ( frac{1+y^2}{1+x^2} )
D. ( frac{1+y^2}{1+x} )
Answer» D. ( frac{1+y^2}{1+x} )


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