NDA 2018 Mathematics question
Consider the following statements : Statement I : If the line segment joining the points and subtends an angle at the origin, then . Statement II : In any triangle ABC, it is true that . Which one of the following is correct in respect of the above two statements?
Answer: (D)
Solution
Statement II is the cosine rule; true. Applying it to triangle OPQ: PQ^2 = OP^2+OQ^2-2\,OP\cdot OQ\cos\alpha gives $α =
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