complex numbers year 2

express e^ix in modulus argument form

cos x + isin x

express -1 in exponential form

e^ipi

express 2cosx in exponential form

e^ix + e^-ix

express 2isinx in exponential form

e^ix - e^-ix

what is r(cosx + isinx )^n

r^n(cosnx + isinnx)