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Ludik32
@Ludik32
October 2021
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( tg a+ctg )^{2} - ( tg a - ctg )^{2}
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dmaxim4ik
( tg a+ctg )^{2} - ( tg a - ctg )^{2}=(tg a+1/tg)^2-(tg a - 1/tg a)^2=((tga^2+1)^2-(tga^2-1)^2)/tga^2=4
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