の) cos(0) sin(0) Let 0 and ø be real numbers, and let A and B be the matrices A = and - sin(0) cos(0) cos(4) sin(ø) B = - sin(ø) cos(4). sin(0+ø) cos(0+ 6) (- sin(0 + ¢) cos(0+ 4) Show that AB = You may use the identities below. (You don't need to use all of them.) sin(o + 0) = sin($) cos(0) ± cos(4) sin(0), cos(ø+ 0) = cos(4) cos(0) + sin(ø) sin(0), 2 cos(0) cos(4) = cos(0 – 4) + cos(0+ ¢), 2 sin(0) sin(ø) = cos(0 – ø) – cos(0 + ¢), 2 sin(0) cos(4) = sin(0 + ¢) + sin(0 – ¢), 2 cos(0) sin(ø) = sin(0 + ø) – sin(0 – ø).

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