Question

ПОЖАЛУЙСТА ПОМОГИТЕ МНЕ ОЧЕНЬ ПРОШУ ВАС УМОЛЯЮ!!

Answer 1

$\displaystyle\bf\\\frac{Cos66^\circ Cos6^\circ+Cos84^\circ Cos24^\circ}{Cos65^\circ Cos5^\circ+Cos85^\circ Cos25^\circ} =\\\\\\=\frac{Cos66^\circ Cos6^\circ+Cos(90^\circ-6^\circ)\cdot Cos(90^\circ-66^\circ) }{Cos65^\circ Cos5^\circ+Cos(90^\circ-5^\circ)\cdot Cos(90^\circ-65^\circ) } =\\\\\\=\frac{Cos66^\circ Cos6^\circ+Sin6^\circ Sin66^\circ}{Cos65^\circ Cos5^\circ+Sin5^\circ Sin65^\circ} =\frac{Cos(66^\circ-6^\circ) }{Cos(65^\circ-5^\circ)}=\frac{Cos60^\circ }{Cos60^\circ} =1$