First slide

Trigonometric equations

Question

If $0 < x < \frac{π}{2}$ then

Moderate

A

$\cos x > 1 - \frac{2}{π} x$
B

$\cos x < 1 - \frac{2}{π} x$
C

$\cos x > \frac{2}{π} x$
D

$\cos x < \frac{2}{π} x$

Solution

It is clear from figure

$\cos x > 1 - \frac{2}{π} x$

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