$\left(m+r\right)-\left(m-r\right)$
$13x+39y$
$\frac{x^4+2x^3-3x^2}{x^3+x^2}$
$\frac{\pi}{\frac{1}{\pi}}$
$\int\frac{\sin\left(x\right)^3}{\cos\left(x\right)\cdot\left(1+4\cos\left(x\right)^2\right)}dx$
$\frac{2x+2a}{x+a}$
$5\sin^2a=5-5\cos^2a$
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