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The total number of solution of cosx=sqr...

The total number of solution of `cosx=sqrt(1-sin2x)` in `[0,2pi]` is equal to (a) 2 (b) 3 (c) 5 (d) none of these

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CENGAGE PUBLICATION-TRIGONOMETRIC FUNCTIONS-All Questions
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  7. The equation sin^4x+cos^4x+sin2x+alpha=0 is solvable for

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  14. If alpha+beta+gamma=2pi, then (a) tan(alpha/2)+tan(beta/2)+tan(gamma...

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