- #1
roldy
- 237
- 2
1. Use Euler's identity to prove that cos^{3}(t)=3/4cos(t)+1/4cos(3t)
2. e^{i[tex]\theta[/tex]}=cos(theta)+i*sin(theta)
3. 3/4cos(t)+1/2cos(3t)=3/4((e^{it}+e^{-it})/2)+1/4((e^{i3t}+e^{-i3t})/2)
2. e^{i[tex]\theta[/tex]}=cos(theta)+i*sin(theta)
3. 3/4cos(t)+1/2cos(3t)=3/4((e^{it}+e^{-it})/2)+1/4((e^{i3t}+e^{-i3t})/2)