Respuesta :

[tex]\huge\rightarrow{{ \underline{ Answer \: \: ✓ }}}[/tex]

[tex] \huge\boxed{x = 15°}[/tex]

Solution :

  • [tex] \cos(3x) = \dfrac{ \sqrt{2} }{2} [/tex]

  • [tex] \cos(3x) = \dfrac{1}{ \sqrt{2} } [/tex]

  • [tex] \cos(3x) = \cos(45) [/tex]

  • [tex]3x = 45[/tex]

  • [tex]x = 15[/tex]

The measure of x = 15°

[tex] \#TeeNForeveR[/tex]