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given that a,b,c,k are positive real numbers ; x,y,z are variable quantities satisfying acos x+bcosy+ccosz=k.find the minimum values of 1)cos2x+cos2y+cos2z 2)acos2x+bcos2y+ccos2z

given that a,b,c,k are positive real numbers ; x,y,z are variable quantities satisfying acos x+bcosy+ccosz=k.find the minimum values of 
1)cos2x+cos2y+cos2z
2)acos2x+bcos2y+ccos2z
 

Grade:9

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