$\sqrt[2]{3}\cot\left(10\right)\left(\tan\left(50\right)-\tan\left(40\right)\right)$

$12c^2-27d^2$

$\int\left(\frac{2x}{5\sqrt{4-x^2}}\right)dx$

$\frac{1-\tan^2\left(a\right)+\tan^4\left(a\right)}{\cos^2\left(a\right)}$

$2a-3b+4c\left(-3\cdot2\right)a$

$\left(2g+1\right)\left(2g-1\right)$

$x^2-x-3;\:x=0$