Saved Bookmarks
| 1. |
Find cos -15π/4 |
|
Answer» Cos (-15π/4)Cos (90+75)-Sin (75)-sin (45+30)-[sin45×cos30 + cos45×sin30]-[1/√2×√3/2 + 1/2×1/√2]-(√3+1/2√2) Cos(4π-π/4)=cosπ/4=1/√2 |
|