Skip to content
MathsGenie logo
Quick links
Open app

Course home

  1. A Level
  3. Maths OCR (MEI)
  5. Question bank

1.7.21 Use identities to solve equations (A-level only)

EasyMediumHard
12345678910111213141516171819202122232425
Question 15
i.

Determine the values of x x\,x in the interval 0<x<π 0 < x < \pi\,0<x<π that satisfy the equation:

(3x−7.5)(3cosec⁡x−2)=0 (3x - 7.5)(\sqrt{3}\operatorname{cosec} x - 2) = 0 (3x−7.5)(3​cosecx−2)=0
[3]
ii.

Solve, for 0∘<θ<360∘0^\circ < \theta < 360^\circ0∘<θ<360∘, the equation:

3cos⁡2θ+8cos⁡θ=1 3\cos 2\theta + 8\cos \theta = 1 3cos2θ+8cosθ=1

Give your answers to one decimal place.

[5]

1.7.21 Use identities to solve equations (A-level only) Questions

  1. A Level
  2. /Maths
  3. /1.7.21 Use identities to solve equations (A-level only)