tan2α = \(\rm\frac{2 tan \alpha}{1-tan^{2}\alpha}\)ব্যবহার করে tan 15°এর মান নির্ণয় করুন, তিন দশমিক স্থান পর্যন্ত।

[√3 = 1.732 ব্যবহার করুন]

This question was previously asked in
SSC CGL 2023 Tier-I Official Paper (Held On: 24 Jul 2023 Shift 1)
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  1. 0.268
  2. 0.27
  3. 0.267
  4. 0.269

Answer (Detailed Solution Below)

Option 1 : 0.268
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প্রদত্ত

 tan2α = \(\rm\frac{2 tan \alpha}{1-tan^{2}\alpha}\)

অনুসৃত সূত্র:

Tan 15° = Tan(45 – 30)°

ত্রিকোণমিতি সূত্র দ্বারা, আমরা জানি,

Tan (A – B) = (Tan A – Tan B) /(1 + Tan A Tan B)

গণনা

অতএব, আমরা লিখতে পারি,

tan(45 – 30)° = tan 45° – tan 30°/1+ tan 45° tan 30°

এখন তালিকা থেকে tan 45° এবং tan 30° এর মান রাখলে আমরা পাব;

tan(45 – 30)° = (1 – 1/√3)/ (1 + 1.1/√3)

tan (15°) = √3 – 1/ √3 + 1

= 1.732 - 1/1.732 + 1

= 0.732/2.732

= 0.268

সুতরাং, tan (15°) এর মান হল 0.268

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