$\frac{3^7}{3}$
$\left(x^2+y^2\right)\left(x^2-y^2\right)\left(x^4+y^2\right)^2$
$-3\left(5p+7\right)-2\left(4p-7\right)-4p$
$\left(sin2x\right)\left(tanx+cotx\right)$
$\left(\frac{\left(1+4x^2\right)}{l^2}\right)^{-\left(\frac{1}{2}\right)}$
$ab^3\left(a^3b^2+ab^3\right)$
$\cos\left(\frac{x}{2}\right)=\frac{1+\sec\left(x\right)}{2\sec\left(x\right)}$
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