If is the angle between any two vectors and

MATHEMATICS · Single correct · A Level · Mathematics · Vectors · Vectors

Problem

19. If θ\theta is the angle between any two vectors a⃗\vec{a} and b⃗\vec{b}, then ∣a⃗⋅b⃗∣=∣a⃗×b⃗∣|\vec{a} \cdot \vec{b}|=|\vec{a} \times \vec{b}| when θ\theta is equal to (A) 0 (B) π4\frac{\pi}{4} (C) π2\frac{\pi}{2} (D) π\pi

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