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The number of solutions of the equation `1+cosx+cos2x+sinx+sin2x+sin3x=0,` which satisfy the condition `pi/2<|3x-pi/2|lt=pi` is

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
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  3. The number of solutions of the equation 1+cosx+cos2x+sinx+sin2x+sin3x=...

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