25. Let OP be the position representation of vector A, 0Q be the position representation of vector B, and OR be the posi- tion representation of vector C. Prove that the area of triangle PQR is (B - A) x (C-A)

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A: Using L'Hospital method, this can be solved very easily. So, I have use that only.

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A: The integral is given by I = ∫cosxsin2x-5sinx-6dx                             ...........1

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