$\left(5x-6y\right)\left(5x+6y\right)$
$3 ^ { \prime } ( - 3 ) 3 = 6$
$-4cos2x=cos\:2x$
$e^{-x}.\tan\left(y+2\right)=1$
$\frac{dy}{dx}=3y+2xe^{-x}$
$sec2xcsc2x$
$\sqrt{4+4x^2}$
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