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Find the minimum value of this trigonometry solution where A, B, C are the angles of a triangle (cos A+cos B+ cos C)

Find the  minimum value of   this trigonometry solution where A, B, C  are the angles of a triangle
                        (cos A+cos B+ cos C)
 

Grade:11

1 Answers

sahil
142 Points
6 years ago
Sol: Just prove that cos(a)+cos(b)+cos(c)=1+4sin(2a).sin(2b).sin(2c) so when 4sin(2a).sin(2b).sin(2c)=0 minimum value occurs that is 1 so 1=or

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