$88\:=\:x\:+\:0.8s$

$\frac{\sec\left(x\right)+\csc\left(x\right)}{1+\tan\left(x\right)}=\frac{1}{\sin\left(x\right)}$

$\sin^2x\cdot\csc^2x-1$

$600\left(90-x\right)^2$

$16\sin^2\left(x\right)+16\cos^2-32\sin\left(x\right)\cos\left(x\right)-16$

$\left(2a\right)^9+\left(b\right)^9$

$a^3+b^3=-9$