$\:\frac{\left(sin\left(x\right)cos\left(y\right)+cos\left(x\right)sin\left(y\right)\right)}{cos\left(x\right)cos\left(y\right)}=tan\left(x\right)+tan\left(y\right)$
$z+6\ge-4$
$\int_0^1\left(\left(3x^3\right)-\left(x^2\right)+\left(2x\right)-4\right)\left(\left(x^2\right)-\left(3x\right)+2\right)^{-\frac{1}{2}}dx$
$4tan\left(x\right)+1=0$
$\frac{dy}{dx}=\frac{1}{\sqrt{1-2x}}$
$\frac{dy}{dx}-\left(\sin\left(x\right)\right)y=2\sin\left(x\right)$
$4x-6$
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