Abby818
Abby818
08-11-2016
Mathematics
contestada
(1+sin y)(1+sin (-y))= cos^2y
Respuesta :
Аноним
Аноним
08-11-2016
Sin (-y)=-sin y
sin²y+cos²y=1 ⇒ cos²y=1-sin²y
Therefore:
(1+sin y)(1+sin(-y))=cos²y
(1+sin y)(1-sin y)=cos²y
1-sin²y=cos ²y
cos²y=cos²y
Answer: it is true this identity .
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