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Prove that cos^4 A - sin^4 A = cos^2 A - sin^2 A
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#iit #class12th #class11th #mathematics #trignometry #ndapreparation
#lecturermathematics #ltmaths #lecture #sscchsl #cds
#iitjeemaths #afcat #sscchsl #rrb #ssc #ibps
Prove that cos^4 A - sin^4 A = cos^2 A - sin^2 A
#lecturermathematics #ltmaths #lecture #sscchsl #cds
#iitjeemaths #afcat #sscchsl #rrb #ssc #ibps
Prove that cos^4 A - sin^4 A = cos^2 A - sin^2 A