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If A+B+C=180,prove that: 1 + cosA.cosB.cosC = cosA.sinB.sinC + cosB.sinC.sinA + cosC.sinA.sinB?

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  • If A+B+C=180,prove that: 1 + cosA.cosB.cosC = cosA.sinB.sinC + cosB.sinC.sinA + cosC.sinA.sinB?


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Anonymous24999
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