$18y^{2}+15y-18$
$-3x\le15$
$1+cscx^2\:+\:cotx^2$
$\left(-2\right).\left(-5\right):\left(-10\right)$
$\frac{36x^4-109x^2+25}{x-3}$
$\:3\left(2x\:-\:7\right)$
$-2\sin\left(9x\right)^2+1$
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