(sin 11pi/18-sin pi/18) / (cos 11pi/18 - cos pi/18)

Question

(sin 11pi/18-sin pi/18) / (cos 11pi/18 - cos pi/18)

Answer 1

                                                 Решение:

 

2sin(5П/18)сos(П/3)/-2sinп/3sin5П/18=-ctgП/3=-1/sqrt(3).