$\sin\left(2x\right)+\cos\left(2x\right)\cot2x=\csc2x$
$7+x-5x^2-4x+9x^2-8x\:\:\:-\:\:x+3xy+2y-11x-xy+9$
$\int_0^{\frac{2\pi}{3}}\left(sin\left(\frac{x}{2}\right)\right)dx$
$\left(2x+8\right)\left(2x-9\right)$
$\int_0^5\frac{y}{y^2+x^2}dy$
$a^2-\left(a+5\right)^2$
$x4-2x^2-1$
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