WAEC Further Mathematics 2015 Paper

Question : 2

Total: 40

Solve:

2\cos x - 1 = 0

Solution:

$2\cos x - 1 = 0 \Rightarrow 2\cos x = 1$

$\cos x = \frac{1}{2}$

$x = \cos^{-1} \left( \frac{1}{2} \right)$

= $\frac{\pi}{3}$ = $\frac{5\pi}{3}$

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