$6\cos^2\left(x\right)=1+5\cos^2\left(x\right)$

$\frac{dn}{dt}=te^{t+2}$

$2-x^2-4+3y+y+y+5$

$\int\left(2x-1\right)arctan\left(3x+5\right)dx$

$log\left(4x-15\right)=log\left(2x-9\right)$

$1+\frac{\cot\left(0\right)}{\tan\left(0\right)}$

$2x^2-12x-14x-2x^2+4x^2-2x-4x^2$