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Asked Sep 29, 2019
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20 cos
COs
47. lim
e
e>0
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20 cos COs 47. lim e e>0

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Expert Answer

Step 1

By using the formula cosx+cosy=-2sin[(x+y)/2]sin[(x-y)/2], we have

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20e 20-Ө sin 2 -2sin cos 20 cos lim 2 lim 80 60 ө 30 sin -2sin 2 2 = lim Ө 80

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Step 2

Now, we use the result that limit of...

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sin 30 2 cos 20 cos e lim (sin 0)(1) 0 -lim sin 1 2 60 e0 2

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Tagged in

Math

Calculus

Limits