# maths

guys help how do you know which wave function to use
(edited 2 months ago)
Original post by Mate1

guys help how do you know which wave function to use

You could probably guess the min/max values and where they occur for this simple one, but as its sin(x)-cos(x), it would probably be simplest to use sin(x-alpha) as that way both sin(alpha) and cos(alpha) are positive so alpha lies in quadrant 1.

You can use others, but you may need to be a bit more careful about calculating alpha...
(edited 2 months ago)
Original post by mqb2766
You could probably guess the min/max values and where they occur for this simple one, but as its sin(x)-cos(x), it would probably be simplest to use sin(x-alpha) as that way both sin(alpha) and cos(alpha) are positive so alpha lies in quadrant 1.

You can use others, but you may need to be a bit more careful about calculating alpha...

Oh right, kinda forgot about that
Original post by Mate1
Oh right, kinda forgot about that

Its one of those things not to worry about too much, though if alpha is in quadrant 2 or 3, you have to be careful if you do a naive atan() calculation.
Original post by mqb2766
Its one of those things not to worry about too much, though if alpha is in quadrant 2 or 3, you have to be careful if you do a naive atan() calculation.

thank you.i was so scared but now i'm fine.hope to get 90%above in maths to impress my maths teacher