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1)a^2×cos o°-2ab×sin 90°+t^2×tg^2 45 2)a^2×sin180°+2ab×cos90°+b^2×tg 45°

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630035

04.08.2020 10:41

Cos0° = 1; sin90° = 1; tg²45° = 1
1) a² - 2ab + t²

sin180° = 0; cos90° = 0; tg45° = 1
a²*0 + 2ab*0 + b² = b²

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