Posted by sam on .
verify that cos(AB)/cosAsinB=tanA+cotB is an identity

trig help 
bobpursley,
isnt Cos(AB)= cosAcosB+sinASinB ?
Posted by sam on .
verify that cos(AB)/cosAsinB=tanA+cotB is an identity
isnt Cos(AB)= cosAcosB+sinASinB ?