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JEE Main Mathematics question

MathematicsSolution of TrianglesJEE Main

Not in JEE syllabus

The area of a is . Then

Answer: (C)

Solution

Expand: \Delta=b^2-(c-a)^2=b^2-c^2-a^2+2ac=2ac-2ac\cos B=2ac\left(1-\cos B\right). Also , so $Missing argument for \frac\frac12 B=2(1-

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Question ID VK-008437