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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 |
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Answer» The correct option (1) 2 Explanation: sinx + sin3x = sin2x ⇒ 2sin2x cosx = sin2x ⇒ sin2x = 0 or cosx = 1/2 ⇒ 2x ∈ {0} x ∈ {π/3} |
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