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Fungsi begin mathsize 14px style f open parentheses x close parentheses equals 3 space cos space 3 x space minus 2 comma space 0 less or equal than x less or equal than straight pi end style naik pada interval ....

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fungsi tersebut naik saat begin mathsize 14px style x equals 0 degree space atau space x equals 120 degree end style

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begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses x close parentheses end cell equals cell 3 space cos space 3 x space minus 2 end cell row cell f apostrophe open parentheses x close parentheses end cell equals cell negative 9 space sin space 3 x end cell row 0 equals cell negative 9 space sin space 3 x end cell row 0 equals cell sin space 3 x end cell row cell sin space 0 end cell equals cell space sin space 3 x space atau space sin space 180 degree space equals sin space 3 straight x end cell row cell 0 plus 2 πk end cell equals cell 3 straight x end cell row cell fraction numerator 2 straight pi over denominator 3 end fraction straight k end cell equals straight x row straight k equals cell 0 comma space maka space straight x equals 0 degree end cell row straight k equals cell 1 comma space maka space straight x equals 120 degree end cell row straight k equals cell 2 comma space maka space straight x equals 240 degree open parentheses tidak space masuk close parentheses end cell row blank blank blank row cell 180 degree plus 2 πk end cell equals cell 3 straight x end cell row cell 60 degree plus fraction numerator 2 straight pi over denominator 3 end fraction straight k end cell equals straight x row straight k equals cell 0 comma space straight x equals 60 degree end cell row straight k equals cell 1 comma space straight x equals 120 degree end cell row straight k equals cell 2 comma space straight x equals 300 degree open parentheses tidak space masuk close parentheses end cell row cell f open parentheses x close parentheses end cell equals cell 3 space cos space 3 x space minus 2 end cell row cell f apostrophe open parentheses x close parentheses end cell equals cell negative 9 space sin space 3 x end cell row 0 equals cell negative 9 space sin space 3 x end cell row 0 equals cell sin space 3 x end cell row cell sin space 0 end cell equals cell space sin space 3 x space atau space sin space 180 degree space equals sin space 3 straight x end cell row cell 0 plus 2 πk end cell equals cell 3 straight x end cell row cell fraction numerator 2 straight pi over denominator 3 end fraction straight k end cell equals straight x row straight k equals cell 0 comma space maka space straight x equals 0 degree end cell row straight k equals cell 1 comma space maka space straight x equals 120 degree end cell row straight k equals cell 2 comma space maka space straight x equals 240 degree open parentheses tidak space masuk close parentheses end cell row blank blank blank row cell 180 degree plus 2 πk end cell equals cell 3 straight x end cell row cell 60 degree plus fraction numerator 2 straight pi over denominator 3 end fraction straight k end cell equals straight x row straight k equals cell 0 comma space straight x equals 60 degree end cell row straight k equals cell 1 comma space straight x equals 120 degree end cell row straight k equals cell 2 comma space straight x equals 300 degree open parentheses tidak space masuk close parentheses end cell row cell f open parentheses x close parentheses end cell equals cell 3 space cos space 3 x space minus 2 end cell row cell f apostrophe open parentheses x close parentheses end cell equals cell negative 9 space sin space 3 x end cell row 0 equals cell negative 9 space sin space 3 x end cell row 0 equals cell sin space 3 x end cell row cell sin space 0 end cell equals cell space sin space 3 x space atau space sin space 180 degree space equals sin space 3 straight x end cell row cell 0 plus 2 πk end cell equals cell 3 straight x end cell row cell fraction numerator 2 straight pi over denominator 3 end fraction straight k end cell equals straight x row straight k equals cell 0 comma space maka space straight x equals 0 degree end cell row straight k equals cell 1 comma space maka space straight x equals 120 degree end cell row straight k equals cell 2 comma space maka space straight x equals 240 degree open parentheses tidak space masuk close parentheses end cell row blank blank blank row cell 180 degree plus 2 πk end cell equals cell 3 straight x end cell row cell 60 degree plus fraction numerator 2 straight pi over denominator 3 end fraction straight k end cell equals straight x row straight k equals cell 0 comma space straight x equals 60 degree open parentheses tidak space masuk close parentheses end cell row straight k equals cell 1 comma space straight x equals 120 degree end cell row straight k equals cell 2 comma space straight x equals 300 degree open parentheses tidak space masuk close parentheses end cell row blank blank blank end table end style

Jadi, fungsi tersebut naik saat begin mathsize 14px style x equals 0 degree space atau space x equals 120 degree end style

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