у'=(tg(x/π))'= 1/cos²(x/4), при х=π у'=1/cos²(π/4)=1/(√2/2)²= 2 -ответ
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у'=(tg(x/π))'= 1/cos²(x/4), при х=π у'=1/cos²(π/4)=1/(√2/2)²= 2 -ответ