Sprawdz czy podana rownosc jest tozsamoscia.
cos2x-sin2x=2cos2x-1
teza:
cos²x-sin²x=2cos²x-1
P=2cos²x-1=2cos²x-(sin²x+cos²x)=2cos²x-sin²x-cos²x=cos²x-sin²x=L
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teza:
cos²x-sin²x=2cos²x-1
P=2cos²x-1=2cos²x-(sin²x+cos²x)=2cos²x-sin²x-cos²x=cos²x-sin²x=L