$2csc^2a$
$\left(x-2\left(x+2\right)\right)$
$y'=x^2+y+1$
$4x^2-44x+21$
$-8\cdot11+9$
$9\cos^2\left(x\right)-4\sin^2\:\left(x\right)$
$-12\left(-12\right)\left(-2\right)$
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