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JEE Advanced Mathematics question

MathematicsTrigonometric Ratio and IdentitiesJEE Advanced

If the is acute angled at C then

Answer: (A)

Solution

(a) and . So

2A+2B-2C=1-2 C[(A-B)-(A+B)]=1-4 A B C<1,

because and ( acute). True.

(b) . If all

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Question ID VK-108734