$1-\left\{2+\left[-6-\left(2+-5\right)-\left(7+3\right)+1\right]-\left[\left(-12+-15\right)+29\right]\right\}$

$\left(-a+2b\right)^2$

$\frac{x^{11}+11x^{4}+18}{x^{4}+9}$

$-\left(9a-7b\right)^2$

$x^2+y^3+2;\:x=1;\:y=-5$

$\log_{12}\left(3n+10\right)=\log_{12}\left(-3n-2\right)$

$cot^2\left(x\right)+sin^2\left(x\right)=\frac{1-sin^2\left(x\right)cos^2\left(x\right)\:}{\sin\left(x\right)^2}$