$3x\:6\:yz+9x\:4\:y\:3\:z+27x\:3\:yz$
$\frac{dy}{dx}x^{2\:cos\:x}$
$45\cdot3$
$42.\left(-2\right)-\left(-7+16\right).\left(-12\right)-\left(-55\right)$
$2a+5a$
$3\:\sin\left(-90^{\circ}\right)$
$\int\frac{x^4-8x^2+8}{x^3-4x}dx$
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