| 1−sinx | 1+sinx | −4sinx | |||
− | = | ||||
| 1+sinx | 1−sinx | cos2x |
| 1 − sinx | 1 + sinx | |||
L = | − | = | ||
| 1 + sinx | 1 − sinx |
| ( 1 − sinx)2 − (1+ sinx)2 | |
= | |
| (1 +sinx)(1 − sinx) |
| 1 − 2sinx +sin2x − 1 − 2sinx − sin2x | |
= | |
| 1 − sinx + sinx − sin2 |
| − 4sinx | − 4sinx | ||
= | = P | ||
| 1 − sin2x | cos2x |