$\:\left(-3xy^2+2x^2y\right)^2$
$y'\:=\:6y^2$
$cos\left(a+b\right).cos\left(a_{-b}\right)=cos^2\:a\:-\sin^2b$
$un=4$
$\left(5x^3-3\right)\left(5x^3+4\right)$
$\left(1+\cos\left(x\right)\right)\left(2+-\cos\left(x\right)\right)$
$4x^2+6x+64-9x^4-3x^2-55$
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