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Prove that: sin^2 6x-sin^2 4x=sin2xsin10...

Prove that: `sin^2 6x-sin^2 4x=sin2xsin10 x`

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`LHS=sin^2 6x-sin^2 4x`
`=(sin6x+sin4x)(sin6x-sin4x)`
`=[2sin((6x+4x)/2)cos((6x-4x)/2)] xx [2cos((6x+4x)/2) sin((6x-4x)/2)]`
`=[2sin5x cosx][2cos5x sinx]`
`=[2sin5x cos5x][2 sinxcosx]`
`=sin(2 xx 5x) sin(2x)`
`=sin2xsin10 x`
`=RHS`
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