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Or anyone really :P

lol, um, meanwhile, can you type the original eq.?

okay

point of inflexion in 24 is found by letting f''(x)=0.
also, you'll need the double angle formulas.

yeah, i know how to = 0 but I don't know how to solve the trig to find the x :(

|dw:1354600377935:dw|

i don't think i've ever seen the Rcos(x−α) form before. :O

okay, thanks for your help!

you're welcome :)