$\tan^2\left(x\right)-5\tan\left(x\right)=-6$

$\int\sin^3\left(6a\right)\cos\left(6a\right)da$

$\lim_{x\to-3}\left(\frac{8x^2+12x}{x^2+8x+3}\right)$

$x\left(x+3\right)-5\left(2x-4\right)=2x$

$\int_0^2\left(\frac{\left(1+x\right)^2}{\sqrt{x}}\right)dx$

$\cosh\cdot\tanh:\sinh$

$\int_a^{\infty}\left(\frac{1}{x^2}\right)dx$