Further Pure Mathematics 4PM1 / Trigonometry / 1.981.98: Trigonometric equations4PM1/1/January/2016 — Question 6 · 6 marksMark as done · Save for laterGiving your solutions to 3 decimal places, solve the equation(a) cosx=0.4\cos x=0.4cosx=0.4, −π<x<π-\pi<x<\pi−π<x<π (2)(b) tan (2θ+π4)=1.5\tan\!\left(2\theta+\dfrac\pi4\right)=1.5tan(2θ+4π)=1.5, 0<θ<π0<\theta<\pi0<θ<π (4)▸ Mark scheme← 1.78: 4PM1/2/June/2017 — Question 101.99: 4PM1/1/January/2016 — Question 7 →
