18pateljas 18pateljas
  • 22-02-2017
  • Mathematics
contestada

(cosx-sinx)^2 = 1-2sinx cosx

Respuesta :

pasha
pasha pasha
  • 22-02-2017
cos^2x - 2cosxcosx + sin^2x = 1 - 2sin x cosx 

So cos^2x + sin^2x = 1 
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