$cot0cos0+sin0=csc0$

$700-5$

$4x+2\:and\:4\left(x+2\right)$

$\left(-5x+b\right)\left(5x+b\right)$

$\frac{\left(t^4-6t^3+2t^2+5t-4\right)}{\left(t^2+t-3\right)}$

$-\frac{5040}{9}$

$\left(1-\cos\left(x\right)\right)\cdot\left(1+\sec\left(x\right)\right)\cdot\arctan\left(x\right)$