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Mathematics, 11.12.2020 07:00 BaileyRyan8320

1. If A+B+C=180 prove that.
cosA/sinBsinC + cosB/sinCsinA + cosC/sinAsinB =2
HELP PLEASE

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1. If A+B+C=180 prove that.
cosA/sinBsinC + cosB/sinCsinA + cosC/sinAsinB =2
HELP PLEASE...
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