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If in a triangle A B C, a=5, b=4, A=(pi)...

If in a triangle `A B C, a=5, b=4, A=(pi)/(2)+B`, then the value of `C` is

A

`tan ^(-1) (1)/(2)`

B

`tan ^(-1) (9)/(40)`

C

cannot be evaluated

D

` tan ^(-1) (1)/(9)`

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