Mathlocked
New member
- Joined
- Nov 16, 2006
- Messages
- 1
I been trying to work these 2 problems for what seems forever
1) Prove: Sec A + Tan A = Tan(pi / 4 + A / 2)
I leave the Sec A + Tan A alone and work the Tan( pi / 4 + A / 2) part.
I keep getting to (1 + Tan A / 2) / (1 - Tan A / 2) and getting stuck there.
The next one been kick my butt for days
2) Prove: (1 + Cos theta + iSin theta)^n + (1 + Cos theta - i Sin theta)^n
= 2^(n+1) Cos^n theta/2 Cos n(theta)/2
I am completely lost in the woods. Even a gentle push in the right direction would be appriecated. Thank you!
1) Prove: Sec A + Tan A = Tan(pi / 4 + A / 2)
I leave the Sec A + Tan A alone and work the Tan( pi / 4 + A / 2) part.
I keep getting to (1 + Tan A / 2) / (1 - Tan A / 2) and getting stuck there.
The next one been kick my butt for days
2) Prove: (1 + Cos theta + iSin theta)^n + (1 + Cos theta - i Sin theta)^n
= 2^(n+1) Cos^n theta/2 Cos n(theta)/2
I am completely lost in the woods. Even a gentle push in the right direction would be appriecated. Thank you!