Single Trigonometric Functions ( trig identities)

1. Mar 7, 2010

imxaxpunk

1. The problem statement, all variables and given/known data

Cos^2x-Sin^2x/2 SinxCosx

3. The attempt at a solution

I changed cos^2x to 1- sin^2x

which then the equation was 1- s sin^2x/2snxcosx and i have no idea how to make this a single trig. function

2. Mar 7, 2010

rock.freak667

If you can't see it immediately then, what is 1-2sin2x the same as? What is 2sinxcosx the same as?

Hint: Look up your double angle formulas.

3. Mar 8, 2010

Superstring

**Hint**

$$sin(a+b)=sina \cdot cosb+sinb \cdot cosa$$

What if a and b where the same number...