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Which of the following quantities is/are...

Which of the following quantities is/are positive? `"cos"(tan^(-1)(t a n4))` (b) `"sin"(cot^(-1)(cot4))` `"tan"(cos^(-1)(cos5))` (d) `"cot"(sin^(-1)(sin4))`

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Which of the following quantities is/are positive? (a) "cos"(tan^(-1)(t a n4)) (b) "sin"(cot^(-1)(cot4)) "tan"(cos^(-1)(cos5)) (d) "cot"(sin^(-1)(sin4))

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