Question

find argument of sin alpha and i cos alpha.

Answer 1

Let z=sinθ5+i1-cosθ5So,argz=tan-11-cosθ5sinθ5       =tan-11-1+2cos2θ102cosθ10sinθ10       =tan-1cosθ10sinθ10       =tan-1tanθ10       =θ10Thus, argz=θ10