$sin\left(x\right)+x+sin\left(2x\right)+x$
$\frac{dy}{dx}=\frac{2\:sin\:y}{x\:cos\:y}$
$\frac{3-3x}{2}<-3$
$y-\:y\:+\:2x\:-\:2x$
$x^2+3x+154$
$sena=\frac{4}{x}$
$\lim_{x\to2}\:\frac{3x-x^2}{3-x}$
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