Math, asked by shambhavikeshari, 1 year ago

sin4 A-cos4A= 2sin2 A-1

Answers

Answered by shinchan3449

L.H.S= (sin2A)^2 - (cos2A)
= (sin2A + cos2A)(sin2A- cos2A)
= 1×( sin2A - 1 + sin2A)
= 2sin2A - 1
= R.H.S
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