Question 115Asked in BPSC TRE 1.0 (2023) Mathematics Class 9-10

If (cos θ − sin θ)/(cos θ + sin θ) = (1 − √3)/(1 + √3) and 0° < θ < 90°, then the angle θ isयदि (cos θ − sin θ)/(cos θ + sin θ) = (1 − √3)/(1 + √3) तथा 0° < θ < 90° है, तब कोण θ है

यदि (cos θ − sin θ)/(cos θ + sin θ) = (1 − √3)/(1 + √3) तथा 0° < θ < 90° है, तब कोण θ है
  1. A30°30°
  2. B60°60°
  3. C45°45°
  4. DMore than one of the aboveउपर्युक्त में से एक से अधिक
  5. ENone of the aboveउपर्युक्त में से कोई नहीं
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Correct answer: (B) 60°60°

Explanation

Dividing by cos θ: (1 − tan θ)/(1 + tan θ) = (1 − √3)/(1 + √3), so tan θ = √3 and θ = 60°.cos θ से भाग देने पर (1 − tan θ)/(1 + tan θ) = (1 − √3)/(1 + √3), अतः tan θ = √3 और θ = 60°।

From BPSC TRE 1.0 (2023) Mathematics Class 9-10 — Previous Year Paper

This is question 115 of BPSC TRE 1.0 (2023) Mathematics Class 9-10 — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.