2tan²xsinx - tan²x = 0 ------------------------- Transpose tan²x to the right side of the equation 2tan²xsinx = tan²x ------------------------- Divide the whole equation with tan²x tan²x will be cancelled out tan²x ÷ tan²x = 1 2sinx = 1 sinx = 1/2 x = arcsin(1/2) x = 30degrees or π/6
