Самостоятельная работа на тему "Знаки тригонометрических функций"

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object(ArrayObject)#871 (1) {
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    ["title"] => string(89) "«Методы решения тригонометрических уравнений». "
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object(ArrayObject)#893 (1) {
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object(ArrayObject)#871 (1) {
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