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TvoiTaksist
@TvoiTaksist
August 2022
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ТРИГОНОМЕТРИЯ, 100 БАЛЛОВ
Упростите
1) sin^2 a -1;
2) sin^2 2a + cos^2 2a + ctg^2 5a;
3)2sin * (a/3) * ctg * (a/3) - cos * (a/3);
4)(cos^2 a-1)/(sin^2 a-1) + tg a * ctg a;
5)(tg a * cos a)/(1+ctg^2 a)
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