1.

For alpha = pi//7 which of the following hold(s) good ?

Answer»

`TAN ALPHA tan 2 alpha tan 3 alpha = tan 3 alpha - tan 2 alpha - tan alpha`
`"COSEC" alpha = "cosec" 2 alpha + "cosec" 4 alpha`
`cos alpha - cos 2 alpha + cos 3 alpha = 1//2`
`8 cos alpha cos 2 alpha cos 4 alpha = 1`

ANSWER :A::B::C


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