$\int\frac{4x}{5+2x+x^2}dx$
$\left(\frac{1}{1+sin\:x}\right)+\left(\frac{1}{1-sin\:x}\right)-2$
$sinasinb=0.5\left[cos\left(a-b\right)-cos\left(a+b\right)\right]$
$\:\:\left(-2\right)\left(-3\right)\left(2\right)\left(-1\right)\left(1\right)\left(-2\right)$
$-9\:+\:-51\:+\:-74\:+\:1\:=\:$
$w-4+7$
$m2-14m$
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