How would I solve the trig equation 5 cos(2x)=2 ?????????????
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What angles within the unit circle have a cosine of 2/5?
Last edited by richard1234; Nov 11th 2012 at 10:14 AM.
assuming solutions in the interval ... let , so since , is an angle in quads I or IV quad I solutions for , (two) ... and so and quad IV solutions (two) ... and so and
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