Question
Download Solution PDFtan2α = \(\rm\frac{2 tan \alpha}{1-tan^{2}\alpha}\)ব্যবহার করে tan 15°এর মান নির্ণয় করুন, তিন দশমিক স্থান পর্যন্ত।
[√3 = 1.732 ব্যবহার করুন]
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFপ্রদত্ত
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
Last updated on Jun 13, 2025
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