ayuda: 2senxcosx+1 - sen2x (seno cuadrado de x)
2 senx.cosx+1 -sen2x(alcuadrado d e x)
2 cosx.cosx +1 - sen2x
dos coseno de x alcudrado) ..2cos2x +1 - (sen2x)
2cos2x +1-(1-cos2x)
2cos2x +1 -1 +cos2x
= 3cos2x-
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2 senx.cosx+1 -sen2x(alcuadrado d e x)
2 cosx.cosx +1 - sen2x
dos coseno de x alcudrado) ..2cos2x +1 - (sen2x)
2cos2x +1-(1-cos2x)
2cos2x +1 -1 +cos2x
= 3cos2x-