$\int\frac{\left(7-4x\right)}{\left(5x^2-9x-2\right)}dx$

$\frac{d^2}{dx^2}\left(\frac{1}{2}csc\:\left(x\right)\right)$

$5+2+3+1$

$0.86=\left(-0.00402\cdot\ln\left(\frac{x}{177.20}\right)^2\right)$

$\tan\left(a-b\right)-\sin\left(a-b\right)+\tan\left(a\right)$

$\left(2m+5n-2\right)^2$

$5a-a+8a-12a+4a$