| π | ||
sinx + cosx = √2sin(x + | ) − zapamiętaj(i wyprowadź) tą tożsamość, często się przydaje. | |
| 4 |
| √2 | ||
sinx + cosx = | ||
| 2 |
| π | √2 | |||
√2sin(x + | ) = | |||
| 4 | 2 |
| π | 1 | |||
sin(x + | ) = | |||
| 4 | 2 |
| √2 | √2 | |||
sinx + cosx = √2(sinx * | + cosx * | ) = | ||
| 2 | 2 |
| π | π | π | ||||
= √2(sinx * cos | + cosx * sin | ) = √2sin(x + | ) | |||
| 4 | 4 | 4 |