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Виктор678
@Виктор678
October 2021
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cos(90+a)cos(180-a)[tg(180+a)+tg(270-a)]
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pomoshnik09
=-sina *(-cosa)*(tga+ctga)= sina*cosa( sina/cosa - cosa/sina)=
= sina*cosa( (sin²a+cos²a / sinacosa))= sin²a +cos²a=1
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Answers & Comments
= sina*cosa( (sin²a+cos²a / sinacosa))= sin²a +cos²a=1