Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §9.4 Complex Numbers, #8 · Complex Numbers · Polar form
Find x and y for the complex numbers x+iy at angles \theta=45^\circ…
Find x and y for the complex numbers x+iy at angles \theta=45^\circ, 90^\circ, 135^\circ on the unit circle. Verify directly that the square of the first is the second and the cube of the first is the third.
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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §9.4 Complex Numbers, #8
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