(2+3)/(1+cos(a))=(3+4)/(1+cos(b))=(2+4)/(1+cos(a+b)) and 0<pi-b<a<pi(2+3)/(1+cos(a))=(3+4)/(1+cos(b))=(2+4)/(1+cos(a+b)) and 0<pi-b<a<pi

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