$5x^2+3\cdot\left(x^2-2x+1\right)$
$\frac{tan\:\:\left(\:\theta\:\right)\:\:}{\sin\:\left(\:\theta\:\right)\:}\:=\:sec\:\left(\:\theta\:\right)$
$\lim_{x\to-2}\left(\frac{x^2-x+a}{x^2+3x+b}\right)$
$6\left(a^2+2\right)^3$
$y'+y=10\cos\left(3x\right)$
$\int3e^{10x}dx$
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