| 1 | sinx | 1 | sinx | |||||
cosx(1 + | + | )(1 − | + | ) | ||||
| cosx | cosx | cosx | cosx |
| sinx | 1 | sinx | 1 | |||||
cosx (1+ | + | )(1+ | − | )= | ||||
| cosx | cosx | cosx | cosx |
| cosx+sinx | 1 | |||
= cosx [( | )2− | ] = | ||
| cosx | cos2x |
| cos2x+2sinxcosx+sin2x | 1 | |||
= cosx ( | − | ) = | ||
| cos2x | cos2x |
| 2sinxcosx | ||
= cosx * | = 2sinx ![]() | |
| cos2x |