$2\cos\left(c\right)^2-1$
$6.2403^3$
$-y+\left(-x+y^3\right)y'=0$
$\left(12a-5\right)\left(12a+5\right)$
$x^4-5x^3+8x^2-4x$
$36a^2-4$
$15abc^2+45a^2bc$
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