If a^2 + b^2 + c^2 = r^2, then the value of ^ -1 ( ab cr ) + ^ -1 ( bc ar ) + ^ -1 ( ca br ) =

MHT CET 2025 Mathematics question

If , then the value of

Answer: (A)

Let , , . Then , , , so . Formula: , whose denominator is ,

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Question ID VK-100642