Question

If θ is the angle between two vectors `veca` and `vecb` then, `veca * vecb` ≥ 0, only when

विकल्प

• `0 < theta < pi/2`

• `0 ≤ theta ≤ pi/2`

• `0 < theta < pi`

• `0 < theta < pi`

Answer 1

`0 ≤ theta ≤ pi/2`

Explanation:

 `veca * vecb  ≥ 0`

⇒ `|veca||vecb| cos theta ≥ 0`

Now, `|veca|` = + ve, = + ve ⇒ `cos theta ≥ 0`

Therefore, `0 ≤ theta ≤ pi/2`