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Mathematics
Mathematics
Problem
19. If
θ
\theta
θ
is the angle between any two vectors
a
⃗
\vec{a}
a
and
b
⃗
\vec{b}
b
, then
∣
a
⃗
⋅
b
⃗
∣
=
∣
a
⃗
×
b
⃗
∣
|\vec{a} \cdot \vec{b}|=|\vec{a} \times \vec{b}|
∣
a
⋅
b
∣
=
∣
a
×
b
∣
when
θ
\theta
θ
is equal to (A) 0 (B)
π
4
\frac{\pi}{4}
4
π
(C)
π
2
\frac{\pi}{2}
2
π
(D)
π
\pi
π
(A) 0 (B)
π
4
\frac{\pi}{4}
4
π
(C)
π
2
\frac{\pi}{2}
2
π
(D)
π
\pi
π
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