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# C2 Trigonometry - Do examiners allow this method? watch

1. I'm fairly confident on the topic of trigonometry but I have a question, in the photo where the book makes "X = 3θ" temporarily, am I able to use this method in the exam? because Exam Solutions (for example) doesn't use this method.
I just want to make sure because I don't want to lose marks on silly mistakes.

Thanks.

Edit: The question of the example is "Solve the equation cos 3θ = 0.766, in the interval 0 ≤ θ ≤ 360"

2. (Original post by ManLike007)
I'm fairly confident on the topic of trigonometry but I have a question, in the photo where the book makes "X = 3θ" temporarily, am I able to use this method in the exam? because Exam Solutions (for example) doesn't use this method.
I just want to make sure because I don't want to lose marks on silly mistakes.
As long as your final answer is given as "theta = this, this, this, this, and that" then that's fine and would garner full marks.
3. Thank you very much!
4. (Original post by ManLike007)
I'm fairly confident on the topic of trigonometry but I have a question, in the photo where the book makes "X = 3θ" temporarily, am I able to use this method in the exam? because Exam Solutions (for example) doesn't use this method.
I just want to make sure because I don't want to lose marks on silly mistakes.

Thanks.

Edit: The question of the example is "Solve the equation cos 3θ = 0.766, in the interval 0 ≤ θ ≤ 360"

Yes, it's perfectly fine to do that. It is done exactly the same on examsolutions. The only difference here is that the variable x is being used to represent 3θ, compared to examsolutions where he uses 3θ directly to change the interval. It is personal preference on how you want to go about representing everything.
5. (Original post by arsalansiddique)
Yes, it's perfectly fine to do that. It is done exactly the same on examsolutions. The only difference here is that the variable x is being used to represent 3θ, compared to examsolutions where he uses 3θ directly to change the interval. It is personal preference on how you want to go about representing everything.
Good point, thanks for your response!
6. (Original post by ManLike007)
Thank you very much!
No problem!

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