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If A in the following options represents area then which of the following is odd ?a) c=a + b - 2abcos8b) A = absin?c)sinA/a=sinb/b=sin C/cd)

If A in the following options represents area then which of the following is odd ?a) c²=a² + b² - 2abcos8b) A = absin?c)sinA/a=sinb/b=sin C/cd) A = 1/2absin?

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