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p { margin-bottom: 0.25cm; line-height: 120%; } If A+B+C+D=2S,prove that sin(S-A)sin(S-B)+sinSsin(S-C)=sinAsinB

p { margin-bottom: 0.25cm; line-height: 120%; }

If A+B+C+D=2S,prove that

sin(S-A)sin(S-B)+sinSsin(S-C)=sinAsinB

Grade:11

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