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JEE Main & Advanced Mathematics Trigonometric Equations Question Bank Relation between sides and angles, Solutions of triangles

  • question_answer
    In any \[\Delta ABC\]if \[a\cos B=b\cos A\], then the triangle is  [MP PET 1984]

    A) Equilateral triangle

    B) Isosceles triangle

    C) Scalene

    D) Right angled

    Correct Answer: B

    Solution :

    \[\sin A\cos B-\cos A\sin B=0\] Þ \[\sin (A-B)=0\]Þ \[A=B\] i.e., isosceles triangle.


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