$6\cos^2\left(x\right)+\cos\left(x\right)-2=0$

$\frac{5}{3}=\frac{12.5}{x}$

$\left(e^x+e^x\right)^{\frac{1}{2}}$

$\int\frac{2x+1}{x^3-x^2-x+1}dx$

$\sin\left(\infty-\pi\right)=-\sin\left(\infty\right)$

$\left(-7\right)\cdot9-\left(2\right)^4+\sqrt[3]{-19+\left(2\right)^3}-9^2\:\cdot\left(-5\right)$

$\int3\left(2^{3x}\right)dx$