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Mathematics 17 Online
OpenStudy (anonymous):

how do you express sin^2x in terms of cos2x?

OpenStudy (jdoe0001):

http://www.sosmath.com/trig/Trig5/trig5/img7.gif <--- notice the 3rd one for the cos(2u) use that one and solve for \(\bf sin^2(u)\)

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