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If cot^3alpha+cot^2alpha+cotalpha=1 the...

If `cot^3alpha+cot^2alpha+cotalpha=1` then (a) `cos2alpha.tanalpha=-1` (b)`cos2alpha.tanalpha=1` (c) `cos2alpha-tan2alpha=1` (d)`cos2alpha-tan2alpha=-1`

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
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