Question
limn→∞ 20∑x=1 cos 2n(x−10) is equal to
Answer: Option B
:
B
limn→∞cos2nx = {1,x=rπ,r∈I0,x≠rπ,r∈I
Here, for x = 10, limn→∞cos2n(x−10) = 1
and in all other cases it is zero
∴limn→∞20∑x=1cos2n(x−10) = 1
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:
B
limn→∞cos2nx = {1,x=rπ,r∈I0,x≠rπ,r∈I
Here, for x = 10, limn→∞cos2n(x−10) = 1
and in all other cases it is zero
∴limn→∞20∑x=1cos2n(x−10) = 1
Was this answer helpful ?
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