Given that sin20=x, cos10=y, state each of the following in terms of x and y a) cos30 b) cos 5
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Originally Posted by Trefoil2727 Given that sin20=x, cos10=y, state each of the following in terms of x and y a) cos30 b) cos 5 a) b) . Now you show some work on your part.
This is part a: There is the identity let and that makes and where
Last edited by jpritch422; Jun 12th 2013 at 06:28 PM.
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