thobza
thobza
11-03-2017
Mathematics
contestada
Show that cos(A+45)=cos45(cosA-sinA)
Respuesta :
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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