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If cos ^(2) A + cos ^(2) B = cos ^(2) ...

If ` cos ^(2) A + cos ^(2) B = cos ^(2) C = 1 ` then show that ` Delta ABC ` is right angled

A

equilateral

B

isosceles

C

right angled

D

none of these

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The correct Answer is:
C
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