Respuesta :
[tex] \huge \boxed{Answer : - }[/tex]
- [tex] \sin(3x) = \cos(x + 6) [/tex]
- [tex] \cos(90 - 3x) = \cos(x + 6) [/tex]
[ Due to complementary relation between sin and cos. ]
- [tex]90 - 3x = x + 6[/tex]
- [tex]x + 3x = 90 - 6[/tex]
- [tex]4x = 84[/tex]
- [tex]x = 21[/tex]
The value of x = 21
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[tex] \#TeeNForeveR[/tex]