angienunez7007 angienunez7007
  • 07-11-2018
  • Mathematics
contestada

Rewrite with only sin(x) and cos(x).

sin(3x)

Respuesta :

Аноним Аноним
  • 09-11-2018

sin 3x = sin (2x + x)

= sin2x cos x + cos 2x sin x   (using the compound angle identity)

= 2sin x cos x.cos x  (1 - 2sin^2x) sinx     (using identities for sin2x and cos2x)


=  2 sin cos^2 x + sin x - 2 sin^3 x

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