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Mathematics, 22.06.2021 14:00 nicollexo21

F A + B + C = 1800

, prove that

sinA. cosA+sinB. cosB+sinC. cosC = 2sinA. sinB. sinC.​

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F A + B + C = 1800

, prove that

sinA. cosA+sinB. cosB+sinC. cosC = 2sinA. sin...
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