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February 28, 2015

February 28, 2015

Posted by **AJ** on Monday, September 23, 2013 at 4:20pm.

sin(x) = 1/3 and sec(y) = 29/21

, where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.)

cos(2y)

- Math -
**Steve**, Monday, September 23, 2013 at 5:31pmcos(y) = 21/29

cos(2y) = 2cos^2(y) - 1 = 2(21/29)^2 - 1 = 41/841

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