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  3. suppose cos(a)=4/5, where 0 ? a ? ?/2.find all sol

Suppose cos(a)=4/5, where 0 ? a ? ?/2.Find all solutions in [0, 2?):cos(2x) = 4/5.

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Suppose cos(a)=4/5, where 0 ? a ? ?/2.Find all solutions in [0, 2?):cos(2x) = 4/5.

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