The output Value best approximates to which of the following?

I'm not able to find out how  to approximate it to higher values,so is there any way to solve it in a simpler way as even for a small value of y like 10,the function involves a lot of computations

1Comment
Sumit Verma @sumitkgp
17 Jul 2017 10:12 pm

You need not to do computation. You will get a series just after analysing a little.