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In a /\ ABC the sides b and c are given....

In a `/_\ ABC` the sides b and c are given. If there is an error dA in measuring angle A, then the error da in side a is given by

A

`/_\ /(2a)dA`

B

`(2/_\)/(a)dA`

C

bc sin A dA

D

none of these

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B
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