$9x^2y^2-4a^2$
$\frac{x}{x-1}-1=\frac{1}{2}$
$\left(n+1\right)^4$
$2y\cdot\frac{dx}{dy}=x\left(x^2-16\right)^{-\frac{1}{2}}$
$10x^2y^2+11y^3$
$3\cdot13$
$\lim_{x\to0}\left(\frac{tan^2\left(x\right)-sen^2\left(x\right)}{x^4.5}\right)$
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