$cot^2x-csc^2x+sec\:x=\frac{1-cos\:x}{cos\:x}$
$-6x^2-6x-12$
$\int14x^{-2}dx$
$\left(x^{12}-y^2\right)^2$
$8y^5-24y^2-16y^2$
$2x\le7x-35-5a$
$4x^2-16x-3$
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