যদি A + B = 90º হয় এবং  tanA = 1/√3 হয়, তবে B এর মান কত?

A 60º

B 30º

C 45º

D 75º

Solution

Correct Answer: Option A

tanA = 1/√3
⇒ tan (90º - B) = 1/√3 [A + B = 90º ]
⇒ cot B = 1/√3 
= cot 60º[ যেহেতু, tan (90º - θ) = cotθ]

∴ B = 60º

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