Browse Questions

# What is the principle value of amplitude of $\;1-i\;$ ?

$(a)\;\large\frac{\pi}{2}\qquad(b)\;-\large\frac{\pi}{4}\qquad(c)\;\large\frac{3\pi}{2}\qquad(d)\;-\large\frac{5\pi}{2}$

Answer : $\;-\large\frac{\pi}{4}$
Explanation :
Let $\;\theta\;$ be the principle value of amplitude of $\;1-i\;$ .
Since $\; \tan \theta =-1$ => $\; tan \theta = tan (-\large\frac{\pi}{4})$
$\theta = -\large\frac{\pi}{4} \;.$