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A : If A+B+C=180^(@) " then " cos^(2) A + cos^(2) B+ cos^2 C =1-2 cos A cos B cos C. R : If A+B+C=180^(@) " then " cos 2A + cos 2B + cos 2C=-1-4 cos A cos B cos C |
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Answer» A is true , R is true and R is CORRECT EXPLANATION of A |
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