$\left(\frac{1}{7}y^{2r+1}-\frac{1}{4}y^{r+2}\right)^2$
$\int_0^1\left(\frac{3x+7}{1+x^2}\right)dx$
$\left(-2\right)\cdot2+\left(-2\right)\cdot2$
$-150\cdot20$
$4x^6-4x^2$
$27a^3\:+\:1\:=\:\left(3a\:+\:1\right)\left(9a^2\:-\:3a\:+\:1\right)$
$\lim_{x\to0}\frac{1-\cos^2\left(x\right)}{x\left(1+cos\:\left(x\right)\right)}$
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