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# C3 help please watch

1. will upload question image in a min
2. will post

3. part c

I get confused as in questions that I have seen they mention that

find the smallest positive value for this maximum occurs or minimum but here they don't
4. (Original post by Qer)
part c

I get confused as in questions that I have seen they mention that

find the smallest positive value for this maximum occurs or minimum but here they don't
Well here they're not interested in max/min, they're interested in a specific value which is 2.
The only difference between the two forms is the -ve sine, which means that instead of you now get instead. Meaning you just have to add on to all your solutions from part (b) and pick the smallest positive one.
5. (Original post by RDKGames)
Well here they're not interested in max/min, they're interested in a specific value which is 2.
The only difference between the two forms is the -ve sine, which means that instead of you now get instead. Meaning you just have to add on to all your solutions from part (b) and pick the smallest positive one.
Can you please explain me why to add 2a(alpha)? I don't understand that point
6. (Original post by Qer)
Can you please explain to me why er have to add 2a(alpha)? I don't understand that point

edit: is that due to this reason that if we add 2alpha in
cos(theta -alpha) we get cos(theta + alpha)?
7. (Original post by Qer)
edit: is that due to this reason that if we add 2alpha in
cos(theta -alpha) we get cos(theta + alpha)?
Apologies, I meant subtract from all your solutions

Though yes, you're on the right lines. If we replace by then our equation (1) becomes (2) and the solutions to eq.(1) are of the form which become hence the solutions to eq.(2) are just
8. (Original post by RDKGames)
Apologies, I meant subtract from all your solutions

Though yes, you're on the right lines. If we replace by then our equation (1) becomes (2) and the solutions to eq.(1) are of the form which become hence the solutions to eq.(2) are just

I understood now

thankyou

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