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# C2 QUESTION HELP needed!

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1. Could somebody give me a STEP BY STEP working out of how to do this answer.

2. (Original post by greentron6)

Could somebody give me a STEP BY STEP working out of how to do this answer.

For the first part just put 1 where t is
3. (Original post by Blake Jones)
For the first part just put 1 where t is
I know that! I'm talking about part b!
4. (Original post by greentron6)
I know that! I'm talking about part b!
haha yeah I'm working that one out in another tab - don't suppose you have an answer that you know is right do you? Got a method but not sure if it's right
5. (Original post by greentron6)

Could somebody give me a STEP BY STEP working out of how to do this answer.

For the second part you know t must be less than 12 and h must be 9 so you can put in what you know to give 9=10+5sin(piT/6)
you can then do 9-10 = -1 = 5sin(piT/6) and then
sin^-1(-1/5)=piT/6 meaning in your next step you can do 6sin^-1(-1/5) / pi = T

Do you know if in this question you're using radians or degrees?
6. (Original post by Blake Jones)
For the second part you know t must be less than 12 and h must be 9 so you can put in what you know to give 9=10+5sin(piT/6)
you can then do 9-10 = -1 = 5sin(piT/6) and then
sin^-1(-1/5)=piT/6 meaning in your next step you can do 6sin^-1(-1/5) / pi = T

Do you know if in this question you're using radians or degrees?
really? it's obvious right?
7. (Original post by thefatone)
really? it's obvious right?
Yeah I thought so with the pi but thought it was worth checking
8. (Original post by Blake Jones)
Yeah I thought so with the pi but thought it was worth checking
i seem to get 11:22am as a time before midday, i can't find any others though :/

Zacken
9. (Original post by Blake Jones)
For the second part you know t must be less than 12 and h must be 9 so you can put in what you know to give 9=10+5sin(piT/6)
you can then do 9-10 = -1 = 5sin(piT/6) and then
sin^-1(-1/5)=piT/6 meaning in your next step you can do 6sin^-1(-1/5) / pi = T

Do you know if in this question you're using radians or degrees?
Apparently, the answer is = 0623, 1137. (The mark scheme says it will allow both radians or degrees, but i used radians).
10. (Original post by greentron6)
Apparently, the answer is = 0623, 1137. (The mark scheme says it will allow both radians or degrees, but i used radians).
11. (Original post by Zacken)
Could you actually give me a step by step explanation of how and why you got the answer?
12. (Original post by greentron6)
Could you actually give me a step by step explanation of how and why you got the answer?
What don't you understand about it? What have you tried?
13. (Original post by Zacken)
What don't you understand about it? What have you tried?
Yes, I tried it and I treated it as a trigonometric equation, however something went wrong after that. That's why was I want a step by step explanation, so I can identify my mistake.
14. (Original post by greentron6)
Yes, I tried it and I treated it as a trigonometric equation, however something went wrong after that. That's why was I want a step by step explanation, so I can identify my mistake.
Post what you've tried and we'll identify your mistake for you.
15. (Original post by Zacken)
Post what you've tried and we'll identify your mistake for you.
16. (Original post by greentron6)
Everything up to

This has several solutions:

This gives (ignoring the negative solutions because time is positive):

and I'll let you do the other one. But 6.384 hours is 6 hours and 23 minutes after midnight.

Can you do the other solution?
17. (Original post by Zacken)
Everything up to

This has several solutions:

This gives (ignoring the negative solutions because time is positive):

and I'll let you do the other one. But 6.384 hours is 6 hours and 23 minutes after midnight.

Can you do the other solution?
Yes, thank you very much!
18. (Original post by greentron6)
Yes, thank you very much!
No problem.

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