$1+\sin\left(2\right)=\left(\sin+\cos\right)^2$

$14x\left(a+b\right)-21y\left(a+b\right)$

$3.1+0\left(-1\right)+\left(-1\right)\left(0\right)$

$\int\:\frac{x}{\left(x+1\right)^7\left(x^2+1\right)}dx$

$\left(cos\left(t\right)-sin\left(t\right)\right)^2+\left(cos\left(t\right)+sin\left(t\right)\right)^2=2$

$xdx+\left(y+2x\right)dy$

$4a-2b-4+ab-11a-3$