$-10-1+9-7$
$\:cot^2\theta\:\left(sec^2\theta\:-1\right)=1$
$x^2-4x-3$
$f\left(x\right)=\left(senx-cosx\right)\left(senx+cosx\right)+2cos^2x$
$-\left(18+12-21\right)-2-\left(8+7-19\right)$
$-5+-4+-1+8+-2+-7$
$3\left(4^2+5\left(4\right)+2\right)^2\left(2\left(4\right)+5\right)$
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