Write the modulus and principal arguments of the complex no. `z = 4 (cos(pi/4) + isin(pi/4))`

Find the modulus and principal argument of -4.

Find the modulus and principal argument of -4.

z=cos(pi/6)+isin(pi/6)=?

cos((3pi)/4)-isin((3pi)/4)=?

Find the modulus and principal argument of the following complex number: 5/2(cos30^0 +isin30^0)

Find the modulus and principal argument of the following complex number: cos70^(0)+i cos20^(@)

Find the modulus and argument of the complex number z =(i^2 +i^3)/(i^4 +i^5)

Find the modulus,argument and the principal argument of the complex numbers: a z=1+cos((10 pi)/(9))+i sin((10 pi)/(9))(b)z=-2(cos30^(@)+i sin30^(@))