$\left|-65\right|-\left|-76\right|$

$\left(sec\:a+1\right)\left(\sec a\:-1\right);\tan^2a$

$10c+9-7c$

$\frac{2}{x}y'+y=0$

$\left(+38\right)-\left(-42\right)-\left(-48\right)-\left(+50\right)$

$f\left(x\right)=\left(3-x^2\right)\left(x^3-5x+3\right)$

$\left(am^6\right)^{\frac{8}{3}}$