1.

Let alpha = 3 cos^(-1) (5/sqrt28) + 3 tan^(-1) ( sqrt3/2) " and " beta = 4 sin ^(-1) ((7sqrt2)/10) - 4 tan^(-1) (3/4), then which of the following does not hold (s) good ?

Answer»

`ALPHA LT PI " but " beta gt pi`
`alpha gt pi " but " beta lt pi`
Both `alpha " and " beta`are EQUAL
`COS ( alpha + beta) = 0`

Answer :A::B::D


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