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If in a triangle ABC , a=5,b=4 ,A =(pi...

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

A

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

B

is ` tan^(-1)"" (1)/(40)`

C

can not be evaluated

D

is ` 2 tan ^(-1) ((1)/(9))`

Text Solution

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The correct Answer is:
D
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