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## Main Question or Discussion Point

I have a cosine function, namely the function for oscillation x=A cos(wt).

I want to separate the t out here, so I can solve for it. My teacher gave the the answer to be t= (arccos (x/a)/2pi)*T, but I can't quite see where he came up with that. Would anyone be as kind as to give me a more elaborate explanation of how this transition was made.

(2pi and T comes from w=2pi/T).

Sorry for bad English, not a native English speaker obviously :)

I want to separate the t out here, so I can solve for it. My teacher gave the the answer to be t= (arccos (x/a)/2pi)*T, but I can't quite see where he came up with that. Would anyone be as kind as to give me a more elaborate explanation of how this transition was made.

(2pi and T comes from w=2pi/T).

Sorry for bad English, not a native English speaker obviously :)