11-03-2017
Mathematics

Answered

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

Verified Answer :

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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