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Asked by souvikkar506 | 22 Jan, 2024, 08:32: PM
Expert Answer
The expression " cosx-cos2x " is factorised as shown below
cosx - cos2x
= cosx - 2 cos2x +1
= 2 cosx - 2 cos2x - cosx +1
= 2 cosx ( 1 - cosx ) + ( 1 - cosx )
= (1-cosx)( 2 cosx+1)
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