Prove that cos2B–cos2A = sin2A–sin2B
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Prove that cos2B–cos2A = sin2A–sin2B81(5*81!58"!16(#81!&8@-?285)$&?296#(5)#)2?_8$3(483(428-773818583&7#83862848185&8@82858_"8185"8835918682"8&8358&(3($8&2(4(
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