$\int\frac{e^{3x}-e^x}{e^{2x}-1}dx$
$\left(4s+\frac{1}{t}\right)^5$
$-0.75x^3+0x^2+9x-15$
$\frac{3^3+x^3}{3+x}$
$\frac{x^3-216^1}{x+6}$
$x\:\frac{2}{2x+1}$
$2cos^2x\left(1+tan^2x\right)$
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