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Problem
Problem
If
∣
A
∣
=
∣
B
∣
=
A
|\mathbf{A}| = |\mathbf{B}| = A
∣
A
∣
=
∣
B
∣
=
A
(say) then,
∣
S
∣
=
∣
A
−
B
∣
=
2
A
sin
θ
2
.
|\mathbf{S}| = |\mathbf{A} - \mathbf{B}| = 2A \sin \frac{\theta}{2}.
∣
S
∣
=
∣
A
−
B
∣
=
2
A
sin
2
θ
.
Prove the above result.
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