How do you proceed i dont get how they got 5pi/12 as thetha

How do you proceed i dont get how they got 5pi/12 as thetha 112 MATHEMATICS Squaring and adding, we obtain _ us-I 2 2 6-1 (6)2+1 4 sine = 4 Hence, r which gives cosO = Therefore, 0 = — + _ = — (Why?) 4 6 12 Hence, the polar form is 57t cos—+isin— 12 12 - Miscellaneous Exercise on Chapter 5

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