First slide

Trigonometric equations

Question

$If 0 < x < \frac{π}{2}, then$

Moderate

A

$\cos x > 1 - \frac{2 x}{π}$
B

$\cos x < 1 - \frac{2 x}{π}$
C

$\cos x > \frac{2 x}{π}$
D

$\cos e c x > \frac{2 x}{π}$

Solution

$∴ \cos x > 1 - \frac{2 x}{π}$

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