$2\cdot0.1505\:+\:0.301$
$5\left(3w+12\right)-12$
$1.67^2$
$cotx=sinxsin\left(\frac{\pi}{2}-x\right)+cos^2xcotx$
$cos\left(x+y\right)-cos\left(x-y\right)=-2sin\left(x\right)sin\left(y\right)$
$\lim_{x\to-1}\left(\frac{3}{x+1}\right)$
$x+3x+2$
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