Use de moivre's formula to derive the identity sin(40) = 4 cos (0) sin(e) - 4 cos(e) sin (0) as well as a similar "quadruple angle" formula for cos(40). s eeeotoble to leave answer in polar or

By DeMoivre's theorem,

Expanding the right side gives

Equating imaginary parts tells us

(Not sure what you mean by sin(e) and cos(e)...)

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.