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Alex15251
@Alex15251
July 2022
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В треугольнике abc угол c равен 90°. tgA=√21/2. Найдите cosA
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В треугольнике ABC угол C равен 90°. tgA=√21/2. Найдите cosA
1/cos²A =1+tg²A=1+21/4=25/4
cos²A =1/(1+tg²A)=4/25 cosA =√(1/(1+tg²A) ) =√(4/25)=2/5=0,4
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В треугольнике ABC угол C равен 90°. tgA=√21/2. Найдите cosA1/cos²A =1+tg²A=1+21/4=25/4
cos²A =1/(1+tg²A)=4/25 cosA =√(1/(1+tg²A) ) =√(4/25)=2/5=0,4