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Which of the following quantities is/are...

Which of the following quantities is/are positive ? a.`cos (tan^(-1) (tan 4))` b.`sin(cot^(-1)(cot 4))` c.`tan (cos^(-1) (cos 5))` d.`cot(sin^(-1) (sin 4))`

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CENGAGE PUBLICATION-INVERSE TRIGONOMETRIC FUNCTIONS-All Questions
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