1.

If 0 ≤ x < π/2, then the number of values of x for which sinx – sin2x + sin3x = 0, is :(1) 2(2) 3(3) 1(4) 4

Answer»

The correct option (1) 2   

Explanation:

sinx + sin3x = sin2x ⇒ 2sin2x cosx = sin2x

⇒ sin2x = 0 or cosx = 1/2

⇒ 2x ∈ {0}    x ∈ {π/3}  



Discussion

No Comment Found

Related InterviewSolutions