- #1
roldy
- 237
- 2
1. Use Euler's identity to prove that cos3(t)=3/4cos(t)+1/4cos(3t)
2. ei[tex]\theta[/tex]=cos(theta)+i*sin(theta)
3. 3/4cos(t)+1/2cos(3t)=3/4((eit+e-it)/2)+1/4((ei3t+e-i3t)/2)
2. ei[tex]\theta[/tex]=cos(theta)+i*sin(theta)
3. 3/4cos(t)+1/2cos(3t)=3/4((eit+e-it)/2)+1/4((ei3t+e-i3t)/2)