18pateljas
18pateljas
22-02-2017
Mathematics
contestada
(cosx-sinx)^2 = 1-2sinx cosx
Respuesta :
pasha
pasha
22-02-2017
cos^2x - 2cosxcosx + sin^2x = 1 - 2sin x cosx
So cos^2x + sin^2x = 1
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