simplify cos2xcosx+sin2xsinx a cosx b sinx c cos3x d sin3x what I tried was.... ?
Follow Math Help Forum on Facebook and Google+
Use , and
Originally Posted by brentwoodbc and edited by Mr F simplify cos(2x) cos(x) + sin(2x) sin(x) a cosx b sinx c cos3x d sin3x what I tried was.... Mr F says: *Ahem* Haven't you forgotten the red sin(x) from above .....? Put it in and expand: ? ..
Thank you.
View Tag Cloud