$\sec^2x+\csc^2x=\frac{\csc^2\left(x\right)}{\cos^2\left(x\right)}$
$3\left(2.7x+5\right)-2\left(4x-1.6\right)$
$1+-3+-3+-7$
$4x^3-8x^2-60x$
$-\left|4\right|+\left|-6\right|$
$-\left(b-c\right)^2$
$m^2-5-2\left(m^2-5\right)$
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