Question 441144
Please find the exact value of 'a':
{{{ cos(a) + sqrt(3) = -cos(a)}}}
..
cos(a) + √3 = -cos(a)
cos(a) +cos(a)  = -√3
2cos(a)=-√3
cos(a)=-√3/2
a=2π/3 & 4π/3 radians in quadrants II & III