$\frac{cos^2x}{1-\sin x}-1=\sin x$
$\left(3x+y\right)\cdot\left(3x-y\right)$
$\int_1^33\sqrt{x^2+x}dx$
$\frac{dy}{dx}=e^{mx}$
$2-4y-6x^2-x^2+y+7x^2-2$
$\frac{\cos\left(v\right)^2}{\sin\left(v\right)^2}-\cos\left(v\right)^2$
$3\cos^2+\sin^2=3$
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