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একটি সূক্ষ্মকোণের sine হলো 5/13। এর cosine নির্ণয় করুন।

A5/12
B8/13
C13/12
D12/13
Answer & Solution
Correct answer: D. 12/13
Cos θ হলো 1 - 25/169 = 144/169 -এর বর্গমূল, যা হলো 12/13।
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