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Which of the following quantities are ra...

Which of the following quantities are rational ?

A

`sin((11pi)/12)sin((5pi)/12)`

B

`"cosec"((9pi)/10)sec((4pi)/5)`

C

`sin^4((pi)/8)cos^4((pi)/8)`

D

`(1+cos""(2pi)/9)(1+cos""(4pi)/9)(1+cos""(8pi)/9)`

Text Solution

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The correct Answer is:
A, B, C, D
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