$-x-9+3x$
$30-\left(-2\right)\cdot\left(-10\right)+\left(-5\right)\cdot\left(-2\right)$
$sec^2a-sec^2a\cdot sin^2a$
$9x^4+6x^3-5x^2+7;\:x=-2$
$\int_1^9e^{5\sqrt{x}}dx$
$9^2-24am^2x^2+144m^4x^2$
$\left(3x^2y-2xy^2\right)^2$
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