Question

2cos(4pi/3)


plz solve this

Answer 1

2cos(4×180/3) = 2cos(240°) lies in 3rd quadrant
where value of cos is negative
2×cos(180°+60°) = -2cos(60°) = -2× 1/2 = -1.

Answer 2

Hey dear here is your answer with that attachment :-

hope it helps !!!