Evaluate limx→∞cos(√x+1)−cos(√x)
For this question I have tried using the squeeze theorem and some trigonometric manipulations such as using 2sinAsinB=cos(A−B)−cos(A+B)
. But they were of no use. I also tried using the substitutions like x=1/y
Hence as x→∞ , y→0 but still no success.
I could've also tried using L'Hospital rule but I am not able to convert the function in appropriate indeterminate form. Any help would be greatly appreciated
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