$\sqrt{\left(81a^2b^2-9a^4\right)\left(3b-a\right)}$
$\left(49x^2+xy+y^2\right)dx-x^2dy$
$\left(tan\:x-1\right)\left(2\:sin\:x-\sqrt{3}\right)=0$
$\frac{e^{-x}sin\left(x\right)}{1-x}$
$\sqrt[12]{27x^3}$
$1+\sin a\cdot1-\sin a=\frac{1}{\sec2a}$
$x-9>2$
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