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Mathematics, 27.02.2020 12:21 bandnerd1

(sina + cosa +1)/(sina+cosa-1)- (1+sina-cosa)/(1-sina+cosa)=2(1+cos eca)

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(sina + cosa +1)/(sina+cosa-1)- (1+sina-cosa)/(1-sina+cosa)=2(1+cos eca)...
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