$\frac{4+4x-6x^4}{2x^2-3}$

$\left(\frac{x^2+2x-3}{x^2+4}\right)$

$tan\left(x\right)cos\left(x\right)cot^2\left(x\right)$

$\frac{45}{28}a^4b^6.\frac{7}{3}ab^3.\frac{4}{5}a^5b$

$\frac{1+\cos\left(45\right)}{\sin\left(45\right)}+\frac{\sin\left(45\right)}{1+\cos\left(45\right)}=2\csc\left(45\right)$

$18d-16d+1$

$\int\left(\:15x^4sin\left(3x^5\right)\right)dx$