railway RRB JE (CBT I + CBT II) Mock Test 2024 Engineering Mathematics Complex Variables Complex Functions
\(\sqrt[3]{{cosx - jsinx}}\) is equal to
1
(cos x)1/3 – j(sinx)1/3
2
\(\sqrt[3]{{{{\cos }^2}x - jsi{n^2}x}}\)
3
\(\cos \frac{{\rm{x}}}{3} - {\rm{jsin}}\frac{{\rm{x}}}{3}\)
4
\(\sin \frac{x}{3} - jcos\frac{x}{3}\)