Evaluate lim
For this question I have tried using the squeeze theorem and some trigonometric manipulations such as using 2\sin A\sin B=\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\to \infty , y\to 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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