$-2+4-\left(-5\right)-\left(-9\right)$
$2\cdot4^{-1}+3\cdot5^{-1}$
$3x^2-4x+2^2$
$\frac{1+\cot^2a}{\sec^2a}$
$\left(x+y\right)\left(x+z\right)-\left(y-w\right)\left(y+w\right)$
$6x^{12}-9$
$e\left(f-g\right)$
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