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# Core 3

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5a? How am i supposed to draw the graph cos-1 x?
2. (Original post by Ayaz789)
5a? How am i supposed to draw the graph cos-1 x?
Remember that cos^-1x is the inverse of cosx.

So if cosx has points like (0,1) and (pi/2,0) then the inverse will have the points (1,0) and (0,pi/2) etc.

Another method is to just use that and remember the shapes of arcsin, arccos and arctan.
3. (Original post by SeanFM)
Remember that cos^-1x is the inverse of cosx.

So if cosx has points like (0,1) and (pi/2,0) then the inverse will have the points (1,0) and (0,pi/2) etc.

Another method is to just use that and remember the shapes of arcsin, arccos and arctan.
Does it work if i put numbers in lol considering i have about half an hour remaining in an exam?
4. (Original post by Ayaz789)
Does it work if i put numbers in lol considering i have about half an hour remaining in an exam?
It might work if you think about the key points of the cos graph, hence find the key points of cos^-1(x) and then use bits inbetween to judge the shape of the graph if you can't remember it.
5. (Original post by SeanFM)
It might work if you think about the key points of the cos graph, hence find the key points of cos^-1(x) and then use bits inbetween to judge the shape of the graph if you can't remember it.
Yeahh i forget very easily :/ so yeah nw
thanks anyways
6. (Original post by Ayaz789)
Yeahh i forget very easily :/ so yeah nw
thanks anyways
if all else fails, look at the graphs of them and sketch them on your paper the minute you start. You can do that in any exam with anything that you'll know you'll otherwise forget
7. (Original post by SeanFM)
if all else fails, look at the graphs of them and sketch them on your paper the minute you start. You can do that in any exam with anything that you'll know you'll otherwise forget
Yeahh true , okay

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