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

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) ((9)/(40))`

C

can not be evaluated

D

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

Text Solution

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The correct Answer is:
B
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