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June 2023
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в треугольнике abc косинус острого угла A равен
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zmeura1204
Відповідь:
12/13
Розв'язання:
Тригонометрическое тождество:
sin²A+cos²A=1
sinA=√(1-(20/52)²)=
=√(2704/2704-400/2704)=
=√(2304/2704)=48/52=12/13
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Answers & Comments
12/13
Розв'язання:
Тригонометрическое тождество:
sin²A+cos²A=1
sinA=√(1-(20/52)²)=
=√(2704/2704-400/2704)=
=√(2304/2704)=48/52=12/13