Question

Trig:
Section - Double Angle Formulas
Simplify:
1.sin(pi/12)*cos(pi/12)
2. tan(22.5)/1-tan^2(22.5) | "22.5 is in degrees"
Help me please

Answer 1

http://www.freemathhelp.com/trig-double-angles.html
all the formulas are in there

Answer 2

I know the formulas but in problem number 1, there is no "2" multiplying sine or cosine?

Answer 3

then it is half of what you want

Answer 4

\[\sin(2\theta)=2\sin(\theta)\cos(\theta)\]
\[\frac{1}{2}\sin(2\theta)=\sin(\theta)\cos(\theta)\]

Answer 5

so
\[\frac{1}{2}\sin(\frac{\pi}{6})=\sin(\frac{\pi}{12})\cos(\frac{\pi}{12})\]