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: '/3^2+4^2+2.3.4.1/2 '/3
: '/9+16+12'/3
:'/37'/3
:6.76 N
b fi^2 + f2^2 -2.f1.f2cos
: '/3^2+4^2-2.3.4.1/2 '/3
: '/9+16-12'/3
: 2.053 N