Mathematics, 22.05.2021 17:10 alyssabond8325
If P+Q+R =180°, prove that cos(Q+R-P) + COS(R+P-Q) + COS (P+Q-R) = SIN^2 P + 4 COSP COSQ COSR + COS^2 P
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If P+Q+R =180°, prove that cos(Q+R-P) + COS(R+P-Q) + COS (P+Q-R) = SIN^2 P + 4 COSP COSQ COSR + COS^...
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