Physics, Chemistry, Mathematics Forums

hello sir and buddies i want  to know the solution of the following quetions as soon as possible..

1)the real part of sin(a+ib) is:

a)sina {(e^x+e^-x)/2}

b)cosa {(e^x+e^-x)/2}

c)sin a

d)none of this

2)if IzI=MAX{Iz-1I,Iz+1I} then

a)Iz+zI=1/2

b)z+z=1

c)Iz+zI=1

d)none of this

here z stands for conjugate of z. I I for mod