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

FURTHER MATHEMATICS
WAEC 2023

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

  • A. 18.43°
  • B. 30.00°
  • C. 35.26°
  • D. 19.47°

Correct Answer: C. 35.26°

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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