Find the solution(s) of the equation in the interval [0, 2𝜋). 7 cos x + 11𝜋 6 − 7 cos x − 11𝜋 6 = −7

Answer 1

7cos(x -11pi/6)=-7

cos(x-11pi/6)=-1

x-11pi/6 = cos^-1(-1)

x-11pi/6=-pi

x =-pi+11pi/6

x= (-6pi+11pi)/6

x=5pi/6