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| 1. |
Sin5x+Sin3x/Cos5x+Cos3x= tan4x |
| Answer» It is done by using the formula - cosx+cosy = 2cos x+y/2 ×cosx-y/2 or sinY+ sinY= 2sinx+y/2 cosX-y/22sinx ×cosx---------------------2cos4X ×cosx=tan X | |