$f\left(y\right)=\frac{10}{y^4-2y^2}$
$\left(2\right)\cdot\left(-7\right)\cdot\left(7\right)$
$2x^2+x+1=x^2-3x-3$
$\int u\cdot x^4dx$
$\frac{sin3a}{sina}+\frac{cos3a}{cosa}=4cos\left(2a\right)$
$\int_0^{\infty}\left(\frac{2x+1}{x^2+x+1}\right)dx$
$9-12t+4t^2$
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