$\cos^{-2}\left(2x\right)=\frac{1}{cos^2\left(2x\right)}$
$\frac{x}{8}+5=6\:\frac{1}{8}$
$\int\frac{1}{\left(x-5\right)\left(x+4\right)}dx$
$cot^2a\:\:\:tan\:a$
$x3+1<0$
$\int3x^3e^xdx$
$56\int\:x^5dx$
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