If a and b are two vectors of magnitude 2 inclined at an angle 60°, then the angle between a and a + b is
30°
60°
45°
None of these
The angle of elevation of the Sun, when the shadow of the pole is times the height of the pole, is
60°
45°
15°
30°
If , then the general value of is
A.
which represent the value of .
A man is standing on the horizontal plane. The angle of elevation of top of the pole is . If he walks a distance double the height of the pole, then the elevation of the pole is . The value of is
The least value of a, for which the function a has at east one solution in the interval , is
9
4
5
1