$\frac{a^3+b^3}{a^2+b^2}$
$\int_{-x}^x\left(t^7\right)dt$
$2\left(7n\:+\:2\right)$
$2cos^2-1=cos2x$
$\int3ln\left(x^2-x+4\right)\:dx$
$15\cdot x^2=10\cdot x^2$
$\int\frac{x^2+3x+1}{x\left(x+1\right)^2\left(x-1\right)}dx$
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