cos(nπ/2) অনুক্রমটির চতুর্থ পদ কোনটি?
Solution
Correct Answer: Option B
ধারাটির চতুর্থ পদ = cos(4π/2) [n = 4]
= cos 2π
= cos 3600 [ π = 180 ]
= 1
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