যদি \(\sin A = \frac{1}{{\sqrt 2 }}\) এবং \({\mathop{\rm Cos}\nolimits} B = \frac{{\sqrt 3 }}{2}\) হয়, তাহলে (A + B)º এর মান নির্ণয় করো।

A. 60º

B. 75º

C. 105º

D. 90º

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  1. C
  2. A
  3. D
  4. B

Answer (Detailed Solution Below)

Option 4 : B
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Detailed Solution

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প্রদত্ত:

Sin A = 1/√2

Cos B = √3/2

ব্যবহৃত ধারণা:

image (1)

গণনা:

ব্যবহৃত ধারণা অনুসারে,

যদি Sin A = 1/√2

⇒ A = 45°

আবার, Cos B = √3/2

⇒ B = 30°

(A + B)° এর যোগফল = 45° + 30° = 75°

(A + B)° এর মান 75°

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