$cot\left(x\right)sin\left(2x\right)=1-cos\left(2x\right)$
$f\left(x\right)=-9x^4-16x^3-7x^2-20x$
$\left(x+y^2\right)+\left(x+4\right)-6$
$\left(a^4b^7+1\right)^3$
$\int_1^{\infty}\left(\frac{1}{1-2x^2}\right)dx$
$x^5-x^4+x^3-x^2$
$x^2-2+6$
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