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| 1. |
Sin² 6x - sin² 4x = sin 2x sin 10x |
| Answer» Sin^26x-sin^24x=(sin6x+sin4x) (sin6x-sin4x)[2sin(6x+4x)/2.cos(6x-4x)/2] [2cos(6x+4x)/2.sin(6x-4x)/2]=2sin5x.cosx.2cis5x.sinx=Sin2x.sin10x Hence proved | |