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# C3 Functions help

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Why bother with a post grad course - waste of time? 17-10-2016
1. I'm just really confused with this.
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2. (Original post by TheAlphaParticle)
I'm just really confused with this.
Which part? What's confusing??
3. (Original post by RDKGames)
Which part? What's confusing??
so how would you find the range to start with? Would you just do F(0) and F(360)?
4. (Original post by TheAlphaParticle)
so how would you find the range to start with? Would you just do F(0) and F(360)?
you just look at the extremes of F(x) with the variable
the max value of sinx is 1 and the min is -1, so you just consider both of those cases
5. (Original post by TheAlphaParticle)
so how would you find the range to start with? Would you just do F(0) and F(360)?
Not really necessary. You can just use transformations from a normal sin(x) graph to work this one out. c stretches the graph in the y-direcion and b translates it. Take the range of the normal sin(x) graph and apply the same transformations really.

EDIT: got the wrong variables
6. (Original post by RDKGames)
Not really necessary. You can just use transformations from a normal sin(x) graph to work this one out. b stretches the graph in the y-direcion and a translates it. Take the range of the normal sin(x) graph and apply the same transformations really.
(Original post by ValerieKR)
you just look at the extremes of F(x) with the variable
the max value of sinx is 1 and the min is -1, so you just consider both of those cases
Ok so it will be b+c and b-c, how about the show the graph crosses the x axis if -c<b<c
7. (Original post by TheAlphaParticle)
Ok so it will be b+c and b-c, how about the show the graph crosses the x axis if -c<b<c
Try drawing the graph, take some initiative
8. (Original post by ValerieKR)
Try drawing the graph, take some initiative
I did and i get it now, its just that questions that i don't understand right away just throw me off. "If in doubt draw it out"- I keep forgetting this.
9. (Original post by TheAlphaParticle)
Ok so it will be b+c and b-c, how about the show the graph crosses the x axis if -c<b<c
Think about what happens b get's closer and closer to -c, and then what happens when it gets closer and closer to +c. As said above, a drawn graph can help.

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