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- Jan 21st 2010, 05:21 AM #1

- Joined
- Dec 2009
- Posts
- 755

## Help!

Use the formula for to show that , and write down a similar expression for .

Given that , express f(x) in the form , where Q, R are constants .

Hence find the greatest and least values of .

I could solve the first part using other formulas but not cos(A+B) formula...

Having problems with expressing sin^2x in a similar way...

Also asking if if the first paragraph is related to the second paragraph of questions...

- Jan 21st 2010, 05:32 AM #2