$\frac{tan\left(x\right)+cot\left(y\right)}{\frac{tan\left(x\right)}{tan\left(y\right)}}$
$\int x\left(x+4\right)^7dx$
$2xy^'+4y=10x^3$
$a+b=3$
$7+3r<4$
$\frac{7-3x}{2}<x+1$
$x^3y^'+4x^2y=e^{-x}$
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