Limx- 0cos 3x-cos 7xx2-

lim _ x→ 0 cos #160; 3x cos #160; 7x x^ 2 (L Hopital rule) lim _ x→ 0 3sin #160; 3x 7sin #160; 7x 2x (L Hopital rule) lim _ x→ 0 9 cos ...

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Definition of Limit

limx→ 0cos 3x...

Question

$lim x \to 0 \frac{cos 3 x - cos 7 x}{x^{2}}$ .

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Solution

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$(v i i i) {lim}_{x \to 0^{-}} \frac{x^{2} - 3 x + 2}{x^{3} - 2 x^{2}}$

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