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artyomya1
@artyomya1
August 2022
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Привет! Друг(Подруга) помоги мне решить математику, что знаешь, и если можно фоточкой)) Огромное тебе спасибо) <3
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ПрофиЗнания
1)y'=3*1/(7x^2-4x)^3 * 3*(7x^2-4x)^2 * (14x-4) = 9*(14x-4)/(7x^2-4x)
2)AB=√(0-1)^2+(3-(-1))^2+(-1-2)^2 = √1+16+9=√26
AC=√(-2-1)^2+(4-(-1))^2+(-5-2)^2 = √9+25+49=√83
cos∠A=AB/AC=√26/√83
∠A≈0,99...≈1
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Answers & Comments
2)AB=√(0-1)^2+(3-(-1))^2+(-1-2)^2 = √1+16+9=√26
AC=√(-2-1)^2+(4-(-1))^2+(-5-2)^2 = √9+25+49=√83
cos∠A=AB/AC=√26/√83
∠A≈0,99...≈1