$\sin^4a-cos^4a$
$20m^5-15m^3+5m$
$\frac{n^{2n+1}}{4^{3n}}\left(2x+17\right)^n$
$\left(7mn+10\right)^2$
$3x-9x+1$
$\lim_{t\to0}\left(\frac{\left(x+t\right)^2-x^2}{t}\right)$
$\int_1^2\left(\left(9x^2-4x+1\right)\ln\left(x\right)\right)dx$
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