2009 · Q16
If 0 ≤ x ≤ x /2, then which one of the following is always correct?
Elementary MathematicsTrigonometry
- Asin 2 x < 1 /2 and cos 2 x >1/2
- Bsin 2 x > 1 / 2 and cos 2 x <1/2
- Csin 2 x < 1 / 2 and cos 2 x < 1/ 2
- DAt least one of sin 2 x, cos 2 x is less than 1cos x sin x
Explanation
Solved; answer D.