$ab\left(x^2-y^2\right)+xy\left(a^2-b^2\right)$
$\int\cos\left(2x\right)^{-1}2dx$
$x^3-10x^2+33x-36$
$\frac{14x^2}{x^8}$
$3cos^2\left(x\right)-sin^2\left(x\right)=4cos^2\left(x\right)-1$
$2.115\left(3.95\right)$
$\left(2x^{4}-8x^{3}+5x-1\right)+\left(6x^{3}+x^{2}+4\right)$
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