raulcantu426 raulcantu426
  • 08-02-2020
  • Mathematics
contestada

sin^(2)x-cos^(2)x=2sin^(2)x-1

Respuesta :

Yang100
Yang100 Yang100
  • 08-02-2020

Answer:

Step-by-step explanation:

sin^2 x+cos^2 x=1

cos^2 x-sin^2 x=1-2sin^2 x

cos^2 x=1-sin^2 x

substitute, you get

1-sin^2 x-sin^2 x=1-2sin^2 x

I just proved this.

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