$\frac{cos\left(x\right)^2}{sin\:\left(x\right)^2}$
$-15m+2m-3m+16m+5m-4m-m$
$15\cos^2x-17\cos x+4=0$
$x^2-15x+10x$
$\frac{d}{dx}3025x^{-1}$
$\left(x-1+iy\right)\left(x+r-iy\right)$
$\frac{12}{3}-2$
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