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Radians

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Question 22
a.

Sketch the graph of

y=4cos⁡2x y = 4 \cos 2x y=4cos2x

for 0≤x≤3π20 \le x \le \frac{3\pi}{2}0≤x≤23π​.

[3]
b.

The equation

4cos⁡2x=k 4 \cos 2x = k 4cos2x=k

has exactly two solutions for the interval 0≤x≤3π20 \le x \le \frac{3\pi}{2}0≤x≤23π​. State the possible values of kkk.

[1]

Radians Questions

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