trygonometria
Mopsik: sin2 25 −sin2 65
−−−−−−−−−−−−−−−−−−−−−−−−
7sin20cos20
27 lis 22:18
Janek191:
sin 65
o = sin( 90
o − 25
o) = cos 25
o
więc
| sin2 25o − sin2 65o | |
| = |
| 3,5*2 sin 20o*cos 20o | |
| | sin2 25o − cos2 25o | | − cos 2*25o | |
= |
| = |
| = |
| | 3,5 sin 40o | | 3,5 *cos 50o | |
| | − cos 50o | | −1 | | −2 | |
= |
| = |
| = |
| |
| | 3,5 *cos 50o | | 3,5 | | 7 | |
27 lis 22:26
Mopsik: <3
27 lis 23:00