$\lim_{x\to0}\left(\frac{\cos\left(2x\right)-1}{sin2x}\right)$
$2\left(x+u\right)$
$4\cos^2x+3\sin x=1$
$15x-2y^4+3x$
$3x^2-27y^2$
$3\sin\:^2\left(x\right)-2cos\left(x\right)-3$
$x^2+18x+8$
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