$10-\left(-2\right)+\left(5\right)+\left(-10\right)-\left(-3-1\right)-\left(15\right)-\left(-6+2\right)-\left(4\right)+\left(-15\right)$

$\tan\left(a\right)\sec\left(a\right)+\frac{1}{1+\sin\left(a\right)}=\sec^2\left(a\right)$

$10^5.10$

$5\left(1+0.1\right)^{0.5}$

$3x^2+\:15x\:-\:5\:=\:0$

$\sqrt{\left(x^2+1\right)\left(x^2+x+3\right)}$

$x^2+16x+1$