[lim(alpha rarr beta)[(sin^(2)alpha-sin^...

[lim_(alpha rarr beta)[(sin^(2)alpha-sin^(2)beta)/(alpha^(2)-beta^(2))]=],[[" (A) "0," (B) "1],[" (C) "(sin beta)/(beta)," (D) "(sin2 beta)/(2 beta)]]

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