Use an identity to write each expression as a trig function value or as a single number.

1-2sin^2(22 1/2 degrees)

and

1/4 - 1/2 sin^2 (47.1 degrees)

Thanks for reading!

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- October 29th 2009, 09:13 PMThatoneguy12345Double Angle Identities
Use an identity to write each expression as a trig function value or as a single number.

1-2sin^2(22 1/2 degrees)

and

1/4 - 1/2 sin^2 (47.1 degrees)

Thanks for reading! - October 30th 2009, 12:49 AMGrandad
- October 30th 2009, 12:51 AMThatoneguy12345
wait for the first one, how did you get cos45?

I begin with 1 - 2 sin ^ 2 (22 1/2) and I end up multiplying the 22 with 1/2 and getting 11. So I end up with 1-2sin^2 11. Is that the correct step?

NVM I get it! Thanks a lot