InterviewSolution
Saved Bookmarks
| 1. |
Solve `7 cos^(2) theta+3 sin^(2) theta=4`. |
|
Answer» We have `7 cos^(2) theta+3 sin^(2) theta=4` `rArr 7(1- sin^(2) theta)+3 sin^(2) theta=4` or `4 sin^(2) theta=3` or `sin^(2) theta =3/4=((sqrt(3))/2)^(2)` or `sin^(2) theta="sin"^(2) pi/3` or `theta= npi pm pi/3, n in Z` |
|