What will be answer and how to solve?!
thanks.
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Extremely childish. This even need not solving it is evidently 0.
More strictly cosx is equal to (1-x^2...) at zero, so you are searching for lim x^2/2x, which is obvious, since x^2 is incomparably smaller than 2x at zero...
Proof
I am wrong, It's ok. nevermind