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## Main Question or Discussion Point

http://i.imgur.com/MDigPh5.png

if i have my original coordinate (white) and i am transforming this into the red coord. , could someone explain to me why y=y'cos[itex]\phi[/itex] is incorrect and why y'=ycos[itex]\phi[/itex] is correct?

if i have my original coordinate (white) and i am transforming this into the red coord. , could someone explain to me why y=y'cos[itex]\phi[/itex] is incorrect and why y'=ycos[itex]\phi[/itex] is correct?