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BITSAT2022MathematicsProperties of TrianglesActual

If in a A B C, 2 b^2=a^2+c^2 , then 3B B is equal to

Options

  1. Ac^2-a^2 2 c a
  2. Bc^2-a^2 c a
  3. C(c^2-a^2 )^2 (c a)^2
  4. D[ c^2-a^2 2 c a ]^2

Correct answer

D. [ c^2-a^2 2 c a ]^2

Step-by-step solution

3 B B = 3 B-4 ^3 B B =3-4 ^2 B=3-4 (1- ^2 B )=-1+ 4 (a^2+c^2-b^2 )^2 4(a c)^2 =-1+ ( a^2+c^2 2 )^2 (a c)^2 =-1+ (a^2+c^2 )^2 4(a c)^2 =( c^2-a^2 2 a c )^2

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