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If in a Delta ABC , cos a cos B +- sin A...

If in a `Delta ABC` , `cos a cos B +- sin A sin B sin C = 1`, then show that `a:b:c = 1:1:sqrt(2)` .

A

isosceles

B

right angled

C

isosceles right angles

D

equilateral

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The correct Answer is:
C
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