FINAL EXAM - math.berkeley.edu
(8)(a)Suppose that cos = 1 ˇ and 0 ˇ 2. Calculate the following: (i)cos 2 (ii)cos(2 + 2ˇ) (b)Use the sum formula for cosine (the rst formula in the \addition and subtrac-tion" section of the reference sheet) to get one of the double-angle formulas. (9)Find all real numbers xthat satisfy the equation: x+ 3 x 3 1 ................
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