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# C3 Trig Question: Where am I going wrong? watch

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1. Question and my working out has attached

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2. It should be 17cos(x + 1.08) = 17
3. (Original post by morgan8002)
It should be 17cos(x + 1.08) = 17
Oh okay

So then I would so

x + 1.08 = arccos(1)

x= 0, pi, 2pi...

And then what would I do?
4. (Original post by creativebuzz)
Oh okay

So then I would so

x + 1.08 = arccos(1)

x= 0, pi, 2pi...

And then what would I do?
x + 1.08 = 0, 2pi. (cos pi = -1)
5. (Original post by morgan8002)
x + 1.08 = 0, 2pi. (cos pi = -1)
Ah, I understand! thank you

Is it alright if you could see what else I need to do in this question? Because I managed to get 3 of the answers but apparently I'm still missing 2 other answers (1.40 and 4.88)

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6. (Original post by creativebuzz)
Ah, I understand! thank you

Is it alright if you could see what else I need to do in this question? Because I managed to get 3 of the answers but apparently I'm still missing 2 other answers (1.40 and 4.88)
I would factorise rather than divide. You are at risk of losing solutions if you divide (like in this case).

7. (Original post by morgan8002)
I would factorise rather than divide. You are at risk of losing solutions if you divide (like in this case).

Ah okay, thanks! I assumed dividing was okay if it involved making tan, but I guess not! Thank you for your help

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Updated: January 28, 2015
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