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# Trigonometry maths homework help watch

1. Hi, can anyone help me with 10i) and 10ii), I have no idea where to start! Thanks for any help
2. (Original post by Imo_rai)
Hi, can anyone help me with 10i) and 10ii), I have no idea where to start! Thanks for any help
For 10 i) can't you square root then use the cos-1 () function?

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3. Both of these lead to standard angles
i) .

ii) .
Just use symmetry and periodicity of the cos and tan curves to find the other values in the range specified.
All the answers are rational multiples of so you get nice answers.
4. (Original post by Imo_rai)
Hi, can anyone help me with 10i) and 10ii), I have no idea where to start! Thanks for any help
Same principal for 10ii) where you add 3, square root and tan-1 ()? Just a suggestion cause this doesn't look like GCSE maths and so I can't really definitely talk about higher maths

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5. (Original post by I'm_infires)
For 10 i) can't you square root then use the cos-1 () function?

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They can, but there may be additional solutions within that range, so it may be best to think geographically or use the CAST diagram or whatever method you normally use.
6. (Original post by Imo_rai)
Hi, can anyone help me with 10i) and 10ii), I have no idea where to start! Thanks for any help
But it does say for 0 <= theta <= 2pi. Sorry I haven't helped much forget me.

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7. (Original post by KaylaB)
They can, but there may be additional solutions within that range, so it may be best to think geographically or use the CAST diagram or whatever method you normally use.
Yeah I noticed the range afterwards

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8. (Original post by B_9710)
Both of these lead to standard angles
i) .

ii) .
Just use symmetry and periodicity of the cos and tan curves to find the other values in the range specified.
All the answers are rational multiples of so you get nice answers.
I think I was just being a bit stupid, this has really helped, thank you
9. (Original post by I'm_infires)
Same principal for 10ii) where you add 3, square root and tan-1 ()? Just a suggestion cause this doesn't look like GCSE maths and so I can't really definitely talk about higher maths

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Yes this worked, thank you for our help, I've managed to do it now

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