how the last 4 lines have been solved...
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4th last line
Common 2sin4x
open formula of cos2x in the breket
cos2x=2cos^2x-1
cancel -1 to +1
and get the answer
Common 2sin4x
open formula of cos2x in the breket
cos2x=2cos^2x-1
cancel -1 to +1
and get the answer
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