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ABC is a trangle whose sides are a units...

ABC is a trangle whose sides are a units, b units and c units respectively and their corresponding opposite angles are A,B and C.
If in the triangle ABC, the side c and angle C remain unchanged while the other sides and angles are changed slightly then the value of `(da)/(cosA) + (db)/(cosB) ` is -

A

0

B

1

C

2

D

-1

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The correct Answer is:
A
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