Mathematics, 27.07.2021 15:10 kuadirkennedy
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sin25 +cos25 ∘ sin65 ∘=sin25 sin(90 ∘−65 ∘ )+cos25 ∘cos(90 ∘−65 ∘ )=sin25∘sin25 ∘+cos25 ∘cos25 =sin 2 25 ∘ +cos 2 25 ∘=1
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sin25 +cos25 ∘ sin65 ∘=sin25 sin(90 ∘−65 ∘ )+cos25 ∘cos(90 ∘−65 ∘ )=sin25∘sin25 ∘+cos2...
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