$\lim_{x\to\frac{\pi}{4}}\left(\frac{\sin\left(x\right)-\cos\left(x\right)}{1-\tan\left(x\right)}\right)^x$
$\frac{x^3x\:x^2}{x^3}$
$\frac{dx}{dy}=\frac{1+y^2}{ycosx}$
$121x^{10}-198x^6+81x^{12}$
$-5\cdot4^2$
$m^4+2m^2+9$
$3x^2y-27y$
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