Question: Let (a) Show that (b) Prove, by mathematical induction, that cos 0 - sin 0 sin 0 cos O cos 20 - sin 20 A?

Letcos 0 - sin 0 sin 0 cos O

(a) Show that cos 20 - sin 20 A? sin 20 cos 20  (b) Prove, by mathematical induction, that
cos 0 - sin 0 sin 0 cos O cos 20 -

cos 0 - sin 0 sin 0 cos O cos 20 - sin 20 A? sin 20 cos 20

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