$\left(1-\cos\left(x\right)\right)\left(1+\cos\left(x\right)\right)\left(1+\cot^2\left(x\right)\right)=1$
$20 = r + 11$
$-a^{m+1}b^{n-2}\:por\:-4a^{m-2}b^{2n+4}$
$-6-\left(-24\right)$
$2\sqrt[3]{x^4}$
$\left(-3x+3\right)\left(3x+2y\right)$
$\frac{2i-1}{i^2+i}$
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