$\frac{cos2x-1}{2sinx}$
$12x-7<18x-9$
$3^{-1}\cdot3^6$
$1^3+1^22-12^2+2^3$
$\lim_{x\to0}\left(\frac{3ln\left(tan\left(x\right)\right)}{ln\left(sin\left(x\right)\right)}\right)$
$\cos2x-\cos x=2$
$25x^2-10x^2+2x$
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