Sketch the graph of $y = -4 \cos 2x + 1$ for $ 0 \leq x \leq 2\pi$. By adding a straight line to

Question

Sketch the graph of $y = -4 \cos 2x + 1$ for $ 0 \leq x \leq 2\pi$. By adding a straight line to your sketch, find the number of solutions to the equation $2\pi \cos 2x - x + \pi = 0$ for $ 0 \leq x \leq 2\pi$.

Accepted Answer

(ii) 4 solutions.

Trigonometry - Trigonometric Functions and Graphs - General

Trigonometry - Trigonometric Functions and Graphs - General

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