$\left(2sin^22t\right)dx+cosx\left(1+cos2x\right)dt$

$\lim_{x\to5}\left(\frac{x^3-2t+115}{x^2-x-30}\right)$

$7+2-12-11+10-5+15-12$

$\lim_{x\to\infty}\left(\frac{7x^2-4x+6}{e^{5x}}\right)$

$\:\left(12\:+5a^2\right)\left(12-5a^2\right)$

$-15-5x\le0$

$\frac{6\cdot10^5}{2\cdot10^9}$