1.

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

Answer»

`tanalphatan2alphatan3alpha=tan3alpha-tan2alpha-tanalpha`
`"cosec"ALPHA = "cosec"2alpha+"cosec" 4alpha`
`COS alpha - cos 2 alpha + cos 3 alpha =1//2`
`8 cos alpha cos 2alpha cos 4 alpha =1`

Answer :A::B::C


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