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Home/Practice questions/General Aptitude Test
General Aptitude TestQuantitative ReasoningTrigonometry

If (sin^2 θ )/(tan^2 θ - sin^2 θ) = 3 and 0° < θ < 90° , then value o…

If \(\frac{sin^2 θ }{tan^2 θ - sin^2 θ}\) = 3 and 0° < θ < 90° , then value of θ is?

Answer & explanation+

Correct answer: option 4

\(\frac{sin^2 θ}{tan^2 θ - sin^2 θ}\) = 3 ⇒ sin2 θ = 3(tan2 θ - sin2 θ)

⇒ 4sin2 θ = 3tan2 θ ⇒  4sin2 θ = \(\frac{3sin^2 θ}{cos^2 θ}\)

⇒ cos2 θ = \(\frac{3}{4}\) ⇒ cosθ = \(\frac{\sqrt {3 }}{2}\)

⇒ cosθ = \(\frac{\sqrt {3 }}{2}\) 

⇒ θ = 30°

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