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katyamelnikova11
@katyamelnikova11
July 2022
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В треугольнике AВС угол с прямой, соsА = корень из 21 деленный на 5. Найдите sinA
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олятруш
АВ²=АС²+ВС²
ВС²=5²-√21²=25-21=4, ВС=2
sin A=2/5=0,4
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Answers & Comments
ВС²=5²-√21²=25-21=4, ВС=2
sin A=2/5=0,4