Santillana ofrece muestra del libro digital en su web oficial. Ve a santillana.es > Bachillerato > Física > Serie Investiga > "Accede a una unidad de muestra gratuita". Esa muestra tiene calidad profesional (300 DPI, completo), incluye 2 temas y está libre de malware.
Santillana sells an official digital license through its platform "Saber Hacer" or "Santillana Digital" . It includes: Santillana ofrece muestra del libro digital en su
We analyzed forum posts from students who have used the unofficial PDF versus the official book. "I downloaded the 'Extra Quality' version
"I downloaded the 'Extra Quality' version. Yes, it had a solucionario, but two problems had wrong answers because the community edit messed up the signs. I failed a test because of that. Now I just use the official teacher's book." – Anonymous, Valencia "For studying Selectividad (EBAU/PEvAU), the PDF is fine
"For studying Selectividad (EBAU/PEvAU), the PDF is fine for theory. But for problem practice, you need the official answer key. The 'Extra Quality' one is missing the reasoning steps." – Usuario de ForoFísica
Conclusion: The unofficial "Extra Quality" is a gamble. Sometimes it’s perfect; often it’s flawed.