Question 94

If cos -4π/3 = x, then the value of x is

Solution

Expression : cos -4π/3

$$\because cos(-x) = cos x$$

= $$cos (\frac{4 \pi}{3})$$

= $$cos (\pi + \frac{\pi}{3}) = -cos (\frac{\pi}{3})$$

= $$-\frac{1}{2}$$

=> Ans - (D)

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