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The knowledge points and formulas of triangle need to be solved urgently in senior high school mathematics compulsory five.
Sine theorem: a/sinA=b/sinB=c/sinC
Cosine theorem: COSA = (B2+C2-A2)/(2 * B * C);
cosb=(a^2+c^2-b^2)/(2*a*c)；
Corner relationship: big side to big angle, small side to small angle.