Official papers

Official 2022 Paper 1 · Q1

Paper 1TrigonometryAlgebra

How many real solutions are there to the equation

2cos⁡4θ−5cos⁡2θ+3=02\cos^4\theta-5\cos^2\theta+3=0

in the interval 0≤θ≤2π0\le\theta\le2\pi?

A11
B22
C33
D44
E55
F66
G77
H88

Read the questions freely. Sign in to check your answer, see the worked solution and save your progress.