$\int-\tan\left(\frac{y}{2}\right)dy$
$9-\left(-8\right)+\left(-20\right)+15$
$\left(-18\right)\left(-10\right)$
$16x^8-17x^4+1$
$2x^2+11x+12$
$\left(1+3z^2\right)^2$
$3+5\cdot\left(-2\right)-4+12:\left(-6\right)$
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