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vladilen597
@vladilen597
July 2022
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Помогите с А19, тригонометрия
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sedinalana
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Tga+ctga=1/tga+tga=(1+tg²a)/tga
4ctga:(1+tg²a+1)/tga=4ctga*tga/(1+tg²a)=4/(1+tg²a)
4/(1+tg²a)*(1+tg²a)=4
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Verified answer
Tga+ctga=1/tga+tga=(1+tg²a)/tga4ctga:(1+tg²a+1)/tga=4ctga*tga/(1+tg²a)=4/(1+tg²a)
4/(1+tg²a)*(1+tg²a)=4