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Solve 6 sin 2θ tan θ = 4, where 0º < θ < 90º

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Further Mathematics WAEC 2023

Solve 6 sin 2θ tan θ = 4, where 0º < θ < 90º

  • 18.43º
  • 30.00º
  • 35.26º checkmark
  • 19.47º

The correct answer is: C

Explanation

6 sin 2θ tan θ = 4, where 0º < θ < 90º

sin 2θ = 2sin θ cos θ and tanθ = \(\frac{sinθ}{cosθ}\)

= 6 x 2sin θ cos θ x \(\frac{sin θ}{cos θ} = 4\)

= \(sin^2 θ = 4\)

= \(sin^2 θ = \frac{4}{12}=\frac{1}{3}\)

=\(sin θ = \frac{\sqrt1}{3}=\frac{1}{\sqrt3}\)

= \(θ = sin^{-1}(\frac{1}{\sqrt3})\)

∴ θ = 35.26º

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