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Trigonometry
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OpenStudy (anonymous):
prove cos a + cos b + cos c= 4cos a/2 cos b/2 sinc/2 -1
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OpenStudy (anonymous):
Is the question correctly framed? If i put a=30deg, b=45deg and c=60deg, I get LHS=2.0731 and RHS=0.7848 If I put a=b=c=30deg, I get LHS=2.5981 and RHS=-0.0341
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