Tyson13
Tyson13 Tyson13
  • 01-03-2019
  • Mathematics
contestada

If cos x=8/17
and 270° < x < 360°
what is cos(2x)⁡?

Respuesta :

LammettHash
LammettHash LammettHash
  • 07-03-2019

It follows immediately from the double angle identity:

[tex]\cos2x=2\cos^2x-1=-\dfrac{161}{289}[/tex]

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