lim _(x -> 0) (sin 2 x-sin x+sin 3 x)/(-2 x)=... A. 3 C. 1

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lim _(x -> 0) (sin 2 x-sin x+sin 3 x)/(-2 x)=... A. 3 C. 1 E. -2 B. 2 D. -1
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lim _(x -> 0) (sin 2 x-sin x+sin 3 x)/(-2 x)=... A. 3 C. 1 E. -2 B. 2 D. -1