Tim Gan Math
Sign up free

Equation in tangent and sine solved by factorising, and a quadratic in cos 2x from a double angle

Equation in tangent and sine solved by factorising, and a quadratic in cos 2x from a double angle

IB Year 6 | Grade 12
8 marks
  1. Solve the equation \(\tan x+2\sin x=0\) for \(-\pi\le x\le\pi\).[4]
  2. Solve the equation \(\cos4x+3\cos2x+2=0\) for \(0\le x\le\pi\).[4]

Solution:

Solution locked

680+ questions here come with free worked solutions. A free account saves your questions and progress; this one needs tuition enrolment.

Create free accountSign inIB Math tuition

Create a free account to practise similar questions.

Create free accountSign inIB Math tuition
Answer:(a) \(x=-\pi,\ -\frac{2\pi}{3},\ 0,\ \frac{2\pi}{3},\ \pi\) (b) \(x=\frac{\pi}{3},\ \frac{\pi}{2},\ \frac{2\pi}{3}\)

Need help? Join our JC Math tuition classes.

Learn more