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Yes the answer converges.
for n =0, limit = 1-cos(1)
for n=positive infinity, limit = 1/2
for n=negetive infinity, limit = 0
You need to learn about limits. There are many formulas you need to keep in mind and manipulate them as needed.
so which formulas u've used here? which tests?
yes m a student
Hey buddy, i am sorry that i did not write a detailed explanation, You just need to take the expansion of cos(x). take upto 2 terms. then it can be easily solved.
try it. if you have still doubt, comment.