Saved Bookmarks
| 1. |
Sin square 100+ cos square 100=?? |
|
Answer» Answer: Sin 100° = sin( 90°*1 +10°) = cos 10° Cos 100° + Cos 10° = 2COS ... Cos100=cos(180-80) =-cos80=-sin10 ... Sin100-sin10=2cos((100+10)/2)sin((100-10)/2). |
|