$\cota\left(\tana+\cota\right)=\cos^{2}a$
$4a^2-7a$
$y=\frac{sin^2xtan^4x}{\left(x^2+1\right)^2}$
$\left(2x+y-z\right)\left(2x+y+z\right)$
$-12x^4+6x^3+24x^5$
$\left(2x+8\right)\left(3y-2\right)$
$\int r^6\left(1+r^7\right)^5dx$
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