Question

Вычислите а) 2cos30°-tg п/6 б)cos73°cos13°+sin73°sin13°

Answer 1

$a) 2 cdot frac{sqrt{3}}{2} - frac{sqrt{3}}{3}=sqrt{3}-frac{sqrt{3}}{3}=frac{3sqrt{3}-sqrt{3}}{3}=frac{2sqrt{3}}{3} \\ b) ...=cos (73^o-13^o)=cos60^o =frac{1}{2}$