$\sqrt{3}\sqrt{7a}$
$\frac{1+sin\left(x\right)+cos\left(x\right)}{cos\left(x\right)}=\frac{1-sin\left(x\right)+cos\left(x\right)}{1-sin\left(x\right)}$
$4yz^2+2z^2y$
$y=log\:x^4$
$\int\frac{1}{1+sen\:u}du$
$\left(\frac{1}{9}a-\frac{3}{4}b\right)^2$
$-13y^5\left(-9x^3y^2\right)$
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