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Show that : (i)\ \ \ \ \ \ \ \ t a n\ 4...

Show that : `(i)\ \ \ \ \ \ \ \ t a n\ 48o\ t a n\ 23o\ t a n\ 42o\ t a n\ 67o\ =\ 1(i i)\ \ \ \ \ \ \ cos\ 38o\ cos\ 52o\ \ s in\ 38o\ s in\ 52o\ =\ 0`

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