thobza thobza
  • 11-03-2017
  • Mathematics
contestada

Show that cos(A+45)=cos45(cosA-sinA)

Respuesta :

ghanami
ghanami ghanami
  • 11-03-2017
Hello here is a solution :
co(a+b)  =cosacosb -sina sinb
cos(A+45)=cosAcos45-sinAsin45
cos45=sin45

cos(A+45)=cosAcos45-sinAcos45=cos45(cosA-sinA)
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