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# Core 3 Trig watch

1. Hi,

I have done part (i) of this question and got (TanP+1)/(1-TanP).

Then for part (ii) I didn't really know where to go. I tried tan(p-5) that didn't really go well.

Any guidance?

Thanks,

Harry
2. (Original post by HarryJDavies)

Hi,

I have done part (i) of this question and got (TanP+1)/(1-TanP).

Then for part (ii) I didn't really know where to go. I tried tan(p-5) that didn't really go well.

Any guidance?

Thanks,

Harry
10=2x5

Use tan(2A) and the quadratic formula
3. (Original post by HarryJDavies)

Hi,

I have done part (i) of this question and got (TanP+1)/(1-TanP).

Then for part (ii) I didn't really know where to go. I tried tan(p-5) that didn't really go well.

Any guidance?

Thanks,

Harry

For part (ii) read TenOfThem's response.

4. (Original post by TenOfThem)
10=2x5

Use tan(2A) and the quadratic formula
wow, just used the quadratic formula and it worked, which exam board is this question? I do OCR A2, and I've never been taught to use it in that way before. Anyone know if this could be asked in an OCR paper, I've never seen something like that before and I can't find it in the textbook.
5. (Original post by Pride)

wow, just used the quadratic formula and it worked, which exam board is this question? I do OCR A2, and I've never been taught to use it in that way before. Anyone know if this could be asked in an OCR paper, I've never seen something like that before and I can't find it in the textbook.
I think it's just a trick thing to make it a lot easier. I do OCR as well, and I can vaguely remember our teacher mentioning this method.
6. (Original post by Pride)

wow, just used the quadratic formula and it worked, which exam board is this question? I do OCR A2, and I've never been taught to use it in that way before. Anyone know if this could be asked in an OCR paper, I've never seen something like that before and I can't find it in the textbook.
I would guess AQA for the question given

I think that this question type could be asked by any board but it may be preceded by proof of the tan(2A) formula to give the hint
7. (Original post by ninuzu)
I think it's just a trick thing to make it a lot easier. I do OCR as well, and I can vaguely remember our teacher mentioning this method.
ahh okay
8. Thanks for all the assistance. But this question is from OCR Core 3 January 2010 paper.

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