tan A = 1 হলে cosA এর মান কত?

A 1/√2

B 1/√3

C 1/2

D 1/3

Solution

Correct Answer: Option A

tanA = 1 
⇒ tan A = tan 45º
⇒ A = 45º

∴  CosA= cos 45º = 1/√2

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