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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((4 pi)/(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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