Please solve this :-
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LHS=cos22x−cos26x
=(cos2x−cos6x)(cos2x+cos6x)
=(−2sin(22x+6x)sin(22x−6x))(−2cos(22x+6x)cos(22x−6x))=(2sin4xcos4x)(2sin2xcos2x)=sin4xsin8x
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