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Ответ

Автор - beijing9
frac{cot a}{cot a+tan a}=frac{frac{cos a}{sin a}}{frac{cos a}{sin a}+frac{sin a}{cos a}}=frac{frac{cos a}{sin a}}{frac{cos^2 a+sin^2 a}{sin acos a}}=frac{cos a}{sin a}*frac{sin acos a}{1}=cos^2 a

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