$4y+yx^2$
$\lim_{x\to0}\left(\cos\left(2x\right)\right)^{\frac{1}{x^2}}$
$x+1+1-3x$
$2y\:-\:2y$
$\left(x-3\right)^2-11\left(x-3\right)+30$
$\int_0^1\left(x^{n-1}\ln x\right)dx$
$\frac{\sin^2t\left(\sec t+\cos\sec t\right)}{\cos t\tan t}=1+\tan t$
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