$3\cos\left(2x\right)+\sin\left(x\right)=0$
$\frac{8x^2+6x-12}{x+4}$
$9z^2-2+10-5z^2$
$2cscx=\frac{1}{1-cosx}+\frac{1}{1+cosx}$
$\int_{-a}^a\left(\frac{1}{x^2+a^2}\right)dx$
$\left(1-x\right)+5c\left(1+x\right)$
$3a^2-2a-1$
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