$\left(sin\left(x\right)-cos\left(x\right)\right)\left(sin\left(x\right)+cos\left(x\right)\right)=1-2cos^2\left(x\right)$
$3x^3+5x^2-11x+3$
$\frac{1}{1-x^5}$
$4x+2x-5=7x-1$
$\left(6m^4-7n^2\right)^2$
$\frac{7m+42}{m^{2}+3m-18}$
$x^2y'-xy=y^2-x^2$
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