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JEE Main Mathematics question

MathematicsSolution of TrianglesJEE Main

Not in JEE syllabus

If in a , , then

Answer: (B)

Solution

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

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Question ID VK-008451