Hello, Freaky-Person!

One of the formulas is: .Solve the following using the double-angle formulas: .

Let

Then we have: .

. .

Since is in Quadrant 1, where sine is positive: .

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- September 9th 2007, 07:00 PM #1
## Itsa me again T.T

Yeah... I'll get professional help with this tomorrow if I can...

Until then... I love you guys XD

The question said to solve the following using the double angle formulas. but I have like no clue what the double angle formula possibly has to do with any of this..

- September 9th 2007, 07:27 PM #2

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