| 1 | ||
sinx*sin2x*sin3x= | *2sin(2x)*cos(2x) | |
| 4 |
| 1 | ||
sinx*sin2x*sin3x− | *sin(2x)*cos(2x)=0 | |
| 2 |
| 1 | ||
sin(2x)*[sinx*sin(3x)− | cos(2x)]=0 | |
| 2 |
| 1 | 1 | |||
sin2x=0 lub | *(2sinx *sin(3x))− | cos(2x)=0 | ||
| 2 | 2 |
| 1 | ||
2x=kπ lub | *[cos(2x)−cos(4x)−cos(2x)]=0 | |
| 2 |
| π | π | |||
x= | *k lub cos(4x)=0⇔4x= | +kπ | ||
| 2 | 2 |
| kπ | π | kπ | ||||
x= | lub x= | + | , k∊C | |||
| 2 | 8 | 4 |