$2\sin^2\left(3x\right)+\sin\left(3x\right)-1=0$
$\left(1.2\:x\:10^5\right)+\left(5.35\:x\:10^6\right)$
$\frac{dy}{dx}=\left(x-3\right)\cdot y$
$\frac{dx}{dy}=10x\left(1-x\right)-3x$
$\lim_{x\to\infty}\left(\frac{1-\cos\left(3x\right)}{x^2}\right)$
$2sen^2x+sen^2x\cdot tan^2x$
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