Question
Solve 2cosxsinx + sinx = 0 using unit circle.
Answers
Reiny
2cosxsinx + sinx = 0
sinx(2cosx + 1) = 0
sinx = 0 or cosx = -1/2
x = 0, π, 2π or x = 2π/3, 4π/3
sinx(2cosx + 1) = 0
sinx = 0 or cosx = -1/2
x = 0, π, 2π or x = 2π/3, 4π/3