EvelynMik
EvelynMik EvelynMik
  • 03-11-2016
  • Mathematics
contestada

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

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Аноним Аноним
  • 03-11-2016
1+sin²x=2-cos²x
Remenber:   sin²x+cos²x=1      ⇒sin²x=1-cos²x
 
1+sin²x=1+(1-cos²x)=2-cos² x       (this is true)

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