$sec5x-cos5x$
$-1^1$
$-3x^3+4x^5-7x;\:x=2$
$\left(7x+4y\right)\left(7x-4y\right)$
$-5x^3+3x^2-x-11x^3-2x^2+2x-4$
$2\left(2+h\right)^2-2+h$
$-\left(2u-4v-1\right)$
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