If p+Q+R=180then prove that;
cos(Q+R-P)+cos(R+P-Q)+cos(P+Q-R)= 1+4×cosP×cosQ×cosR...
Mathematics, 01.04.2020 18:39 boo3972
If p+Q+R=180then prove that;
cos(Q+R-P)+cos(R+P-Q)+cos(P+Q-R)= 1+4×cosP×cosQ×cosR
Answers: 1
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