Cos A cos c + cos ( A+ B) cos ( B+C)/ Cos A cos c - Sin C Cos ( B+ c)
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CosACosC+Cos(A+B) Cos (B+C)/CosACosC-SinCCos(A+B)
dividing by cosAcos c in numerator and denumerator
pk515494:
it's a half answe
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