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

$\frac{16}{25}a^6b^8-81c^{10}d^{16}$

$x^3\cdot x$

$\int\left(ln\left(2x+5\right)\right)dx$

$\int\left(e^{\frac{x}{a}}+1\right)^{\frac{1}{3}}\cdot e^{\frac{x}{a}}dx$

$\int_1^4\frac{9-\sqrt{x}}{\sqrt{x}}dx$

$\cot\left(a\right)-\sec\left(a\right)=\frac{\cos\left(a\right)-\tan\left(a\right)}{\tan\left(a\right)\cdot\cos\left(a\right)}$