$\int\left(\:\cos\left(2x\right)\right)dx$
$\frac{3\left(cos2x\right)-1}{cosx}$
$5x^2yz^3\cdot\left(-4x^4y^6\right)^2$
$8+v=-5$
$25x^2+20x+4=1$
$7-9-\left(-4\right)+2$
$x^2-8x-56=0$
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