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AP EAMCET201726 Apr 2017Morning ShiftMathematicsProperties of TrianglesActual

In A B C , if is any angle, then b (C+ )+c (B- )=

Options

  1. Aa
  2. Ba
  3. Ca
  4. Da

Correct answer

B. a

Step-by-step solution

Given that, aligned b (C+ )+c (B- ) & =b( C & - C ) & +c( B + B ) aligned aligned =b C +c B -b C & & +c B = & (b C+c B) & - (b C-c B) aligned Since by projection formula and by sine rule aligned & b B c C b C-c B=0 & b (C+ )+c (B- ) & =a - 0 & =a - 0=a aligned

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