1.

Which of the following quantities are rational ?

Answer»

`sin((11pi)/12)sin((5pi)/12)`
`"COSEC"((9pi)/10)SEC((4pi)/5)`
`sin^4((pi)/8)cos^4((pi)/8)`
`(1+cos""(2PI)/9)(1+cos""(4pi)/9)(1+cos""(8pi)/9)`

Answer :A::B::C::D


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