$\left(x^4-2x^3+2x^2\right)-\left(5x^3-10x^2+15x\right)$
$\left(3x+8\right)\left(x+8\right)$
$x+3+x+3+2x+2$
$\sin2x=-\cos x$
$\frac{7x^2}{1-x^2}$
$\sin x\left(\sec x+\csc x\right)=\tan x+1$
$y'=xy^2+16x+3y^2+48$
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