$1+\tan\left(a\right)^2\left(1-\sin\left(a\right)^2\right)=1$

$\left(-39\right)-\left(-84\right)$

$\log_{12}\left(x-3\right)+\log_{12}\left(x+1\right)=1$

$x\cdot4^{8\:}\:$

$g\left(x\right)=\left(\frac{\sin\left(x\right)}{1+\cos\left(x\right)}\right)^5$

$20z^2+4z$

$y^2+2y-35$