A, B, C are the angles of a triangl...
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A, B, C are the angles of a triangle Abc = cos(34+23+C) + cos(434) = 3A + 2B+C) A, B, C are the angles of a triangle ABC cos + COS 1) 0 2) 1 3) COSA 4) cosC

JEE/Engineering Exams
Maths
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( begin{aligned} &left(frac{3 A+2 B+C}{2}right)+cos (A-C) =& cos left(frac{2 x-2 A-2 c+3 A+C}{2}right)+cos left(frac{A C}{2}right) &=cos left(pi+frac{A-C}{2}right)+cos left(frac{A-C}{2}right) =&-cos left(frac{A-C}{2}right)+cos left(frac{A C}{2}right) =& 0 end{aligned} )
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