javiers150870 javiers150870

29-04-2021
Mathematics

contestada

demostrar la siguiente identidad: cos2α= cos²α - sen²α

Respuesta :

mayasunar969 mayasunar969

29-04-2021

Step-by-step explanation:

cos2a

cos(a+a)

(cosa.cosb-sina.sinb)*formula

cosa.cosa-sina.sina

cos^2 a-sin^2 a

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