$-\tan\left(-x\right)\cot\left(-x\right)$

$+4a-4a$

$60^0$

$\sqrt{\frac{\sin^2\left(2t\right)}{2}+2t\sin\left(2t\right)\cos\left(t\right)+4t^2\cos^2\left(t\right)}$

$\int\frac{1}{\left(\sqrt{x^2+2x+26}\right)}dx$

$-2\cdot700$

$\lim_{x\to\infty}\left(\frac{\left(-2\right)^{1+3\cdot\left(x+1\right)}}{5^{x+1}\cdot\left(x+1\right)^3}\right)$