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1 - cos 2x : 1 - cos x
lim x-> 0
2 sin² x : 2 sin² 1/2x
lim x-> 0
sin x . sin x : sin 1/2x . sin 1/2x
=> 1 . 1 : 1/2 . 1/2
=> 1 : 1/4
=> 4