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x⇒0 1 - Cos4x x⇒0 2Sin²2x (x²)(2x)²
= l i m Sin²x 4x² x²
x⇒0 x² Sin²2x 4x²
= 1(1)(1/4)
= 1/4
x->0
= lim (2sin² x)/(2sin² 2x)
x->0
= x²/4x²
= 1/4