$1-\left|0.3\right|$

$2\ln\left(x-3\right)-\ln\left(x^2-9\right)$

$\frac{1}{\left(2x^2-6\right)^{-\frac{5}{2}}}$

$\int\sin\left(6\right)dn$

$\left(2x^3+3\right)-\left(2x^3-3\right)$

$x2\:-\:7x\:-\:30\:$

$\sec\left(x\right)-\tan\left(x\right)\sin\left(x\right)-\frac{1}{sec\left(x\right)}$