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Most Important Selected Qs for JEE AdvancedMathematicsTrigonometry

If and - are the roots of the equation a x^2-b x-c=0 , where a, b, c are the sides of a triangle A B C , then B is equal to

Options

  1. A1- c 2 a
  2. B1- c a
  3. C1+ c 2 a
  4. D1+ c 3 a

Correct answer

C. 1+ c 2 a

Step-by-step solution

aligned & - = b a & = c a & b^2=a^2-2 a c & B= a^2+c^2-b^2 2 a c =1+ c 2 a aligned

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