$\lim_{x\to0}\frac{\sqrt{2}-\sqrt{1-\cos\left(2x\right)}}{\sin\left(x\right)^2}$
$-26-\left(-14\right)-20+\left(-2\right)$
$cosec\left(x\right)=1.155$
$\int\cos\left(7t\right)\cos\left(5t\right)dt$
$x^2+9x-5<0$
$( 3 w + 1 ) ( 3 w - 1 )$
$\frac{d}{dx}x^7=e^{-2x^7-5y^7}$
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