$\frac{\sec\:\left(x\right)-\csc\:\left(x\right)}{\csc\left(x\right)-\sec\left(x\right)}$

$\int x\cdot\frac{arctgx}{\sqrt{1+x^2}}dx$

$4\left(x+1\right)^{\frac{1}{2}}-5\left(x+1\right)^{\frac{3}{2}}+\left(x+1\right)^{\frac{5}{2}}$

$x^2-7x+12<0$

$9\left(-2\cdot\left(-1\right)\cdot0\right)\cdot\left(-3\right)$

$\frac{5}{a}a+\frac{7}{a}a-\frac{3}{a}a^2$

$a^2-9a-8$