$\cos^4\left(x\right)-\cos^2\left(x\right)+\sin^2\left(x\right)=\sin^4\left(x\right)$

$\sec\left(b\right)\cdot\tan\left(b\right)\cdot\cos\left(b\right)\cdot\csc\left(b\right)$

$2x^2-4xy$

$\frac{1}{4}x^{6}y^{4}t^{2}-y^{2}x^{3}t$

$x^4-9x^2+\frac{-5}{x}-2$

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

$\frac{dn}{dt}=nte^{t+8}$