$\left(\frac{b^{\frac{3}{4}}}{b^{\frac{1}{4}}}\right)^{\frac{1}{2}}$

$\left(3xy^2-12x+5y\right)+\left(xy^2+7x-9y\right)$

$\frac{cot\left(x\right)}{csc\left(x\right)+1}$

$\lim_{x\to0}\:x\left(\cos\left(x-1\right)\right)$

$\tan\left(2x\right)+\cot\left(2x\right)$

$9^x-5\cdot3^x=-6$

$\left(-2+t\right)^2$