$10^3\cdot12$

$\left(\frac{1+x}{1-x}\right)^{0.5}$

$\frac{d}{dx}\left(sin4x\right)^{3x}$

$\lim_{x\to0}\frac{1}{\sqrt{8x\:+1}}$

$2a^2-7a+3$

$\int_{sen\left(x\right)}^{5x}\sqrt{t^2+1}dt$

$\left(\cos^2\left(x\right)+\frac{1}{\tan^2\left(x\right)}\right)\cdot\frac{1}{\csc^2\left(x\right)}$