$7ba^2-\frac{2}{5}a^2b$

$\int\left(\frac{x^2}{\sqrt{a^2}+\sqrt{b^2}}-\frac{3x}{\sqrt{a}}-5\sqrt{b}\right)\:dx$

$\left(x+3\right)-\frac{1}{2}$

$\lim_{x\to0}\left(\left(1+x\right)^{\frac{1}{\tan\left(x\right)}}\right)$

$0.42^{12}$

$4x^2-5x-6=0$

$\lim_{x\to\infty}\:\frac{-\frac{1}{2}^{x+1}}{1-\frac{1}{2}^x}$