sen2x=2senx.cosx
cos^{2}x - sen^{2} x=cos2x
2(sen^{2} x)=1-cos2x
2(cos^{2}x) =1+cos2x
Tan2x=2.tanx/(1-tan alcuadrado de x)
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sen2x=2senx.cosx
cos^{2}x - sen^{2} x=cos2x
2(sen^{2} x)=1-cos2x
2(cos^{2}x) =1+cos2x
Tan2x=2.tanx/(1-tan alcuadrado de x)