tan2α = \(\rm\frac{2 tan \alpha}{1-tan^{2}\alpha}\) नित्य समीकरण वापरून, tan 15° चे मूल्य तीन दशांश स्थानापर्यंत शोधा.

[√3 = 1.732 वापरा]

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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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दिलेले आहे

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

वापरलेले सूत्र:

Tan 15° = Tan(45 - 30)°

त्रिकोणमिती सूत्रानुसार, आपल्याला माहित आहे,

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

गणना

म्हणून, आपण लिहू शकतो,

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

आता सारणीमधून tan 45° आणि tan 30° चे मूल्य ठेवू;

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

म्हणून, tan(15°) चे मूल्य 0.268 आहे.

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