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Foreverangel:
(sinx−cosx)(sin x+cos x)=1 − 2cos²x I need help with the steps there should be 4
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Vocaloid:
use foil/difference of squares to expand (sinx−cosx)(sin x+cos x) then use the identity sin^2(x) + cos^2(x) = 1 to re-write your problem in terms of cos only. (major hint: solve the identity for cos^2(x))
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