1.

Find how many rounds of differentiation are required to have finite limit for \(lt_{x\rightarrow 0}\frac{cos(ax)+cos(bx)-2cos(cx)}{cos(ax)+2cos(bx)-3cos(cx)}\) given that a ≠ b ≠ c

A. 3
B. 0
C. 2
D. 4
Answer» D. 4


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