$\frac{3-3\cos^2\left(x\right)}{sin^2\left(x\right)}$
$\lim_{x\to\infty}\frac{5^x+3^x}{5^x+2^x}$
$3+5+\left(4+6\right)+7$
$20x-14>0$
$\frac{dx}{dt}=-2tx$
$64^{64}$
$\left(3-secx\right)\left(9+3secx+sec^2x\right)$
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