$5x^2=450$
$\frac{x^2}{\left(x-3\right)\left(x+2\right)^2}$
$\frac{\sin\left(2x\right)}{\sin\left(x\right)+\cos\left(x\right)+1}-\sin\left(x\right)$
$-81\:r\:\:-13r\:-45$
$-2wc^2-4\left(wc-wc^2\right)-2c\left(6-w\right)-9w+20$
$x^3+y^3=4$
$y'=e^{-2t+3y}$
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