Re: Year 11 2012 Chit Chat Thread
(referring to part i.) normally when solving acosx + bsinx, you usually put it in the form of Rcos(x-a) for the coeficients of cosx and sinx to be in same sign, therefore solving the angle is easier when it's in the first quadrant i.e. under 90 degrees. Cambridge is just making you to do the other way with Rcos(x+a) so you get angles in either the 2nd, 3rd or 4th quadrants. They all lead to the same answer, however I guess they are trying to get you to realise what would happen if you change the signs?
I actually haven't done the 2E homework lol, so correct if I'm wrong
(referring to part i.) normally when solving acosx + bsinx, you usually put it in the form of Rcos(x-a) for the coeficients of cosx and sinx to be in same sign, therefore solving the angle is easier when it's in the first quadrant i.e. under 90 degrees. Cambridge is just making you to do the other way with Rcos(x+a) so you get angles in either the 2nd, 3rd or 4th quadrants. They all lead to the same answer, however I guess they are trying to get you to realise what would happen if you change the signs?
I actually haven't done the 2E homework lol, so correct if I'm wrong
Last edited: