$\frac{-1+\sec\left(x\right)\cos\left(x\right)}{\sec\left(x\right)\tan\left(x\right)}=0$
$\sqrt[6]{27\cdot x^2}\cdot\sqrt{9x}\cdot\sqrt[3]{9x^2}$
$3x^2-11+6$
$3x^2-6xy+4x-8y$
$x^2+3-2$
$\int\frac{3x+7}{\sqrt{5x-1}}\:dx$
$3x^3-3x^2-x$
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