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If A + B + C = 180° thencos A cos C + cos(A + B) cos(B + C)------------------------------------------------cos A sin C-sin(A + B) cos(B+C)simplifies to |
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Answer» Step-by-step EXPLANATION: A+B = 180-C B+C = 180-A so QUESTION SIMPLIFIES as: (cosAcosC + cosCcosA) ___________________ (cosAsinC + sinCcosA)
which can be SIMPLIFIED to, (2cosAcosC)/(2cosAsinC) = COTC |
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