$40-\left(-23\right)$
$2cos\left(2x\right)=-4cos\left(x\right)-3$
$\frac{a}{4}+\frac{b}{3}+c;\:a=8;\:b=6$
$\lim_{n\to\infty}\left(\ln\left(x+1\right)\right)$
$\left(3m^2n+4m\right)^3$
$4mn+3mn$
$\frac{\tan\left(x\right)+\tan\left(y\right)}{\tan\left(x+y\right)}+\frac{\tan\left(x\right)-\tan\left(y\right)}{\tan\left(x-y\right)}$
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