$-0.75-\left(-\frac{2}{5}\right)+0.4+\left(-\frac{3}{4}\right)$

$x+\frac{1}{x}-5=\frac{5}{3}$

$\frac{\sin\left(y\right)}{\csc\left(y\right)}+\frac{\cos\left(y\right)}{\sec\left(y\right)}$

$\lim_{x\to1}\:\frac{x^8-1}{x^5-1}$

$x^2-2x-160=0$

$\arcsin\left(\frac{12}{20}\right)$

$-49a^{10}^n-\frac{h^{12x}}{81}$