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# prove that tan(6theta)=............... Watch

1. Could somebody possibly help me with question 8b please?
Thanks

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2. (Original post by Mutleybm1996)

Could somebody possibly help me with question 8b please?
Thanks

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3. (Original post by notnek)
The second image is as far as I've got in this case

Would i need to convert all of the cos's on the top into sin's and divide through by cos? or something along those lines?

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4. (Original post by Mutleybm1996)
The second image is as far as I've got in this case

Would i need to convert all of the cos's on the top into sin's and divide through by cos? or something along those lines?

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Sorry, I didn't see your second image. Try dividing top and bottom by
5. (Original post by notnek)

like this?

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6. (Original post by notnek)
Sorry, I didn't see your second image. Try dividing top and bottom by

here...i think...

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7. (Original post by notnek)
Sorry, I didn't see your second image. Try dividing top and bottom by
sorted it!

thank you!

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8. (Original post by notnek)
Sorry, I didn't see your second image. Try dividing top and bottom by
Can I quickly ask how to do part c? My calculator is not giving me exact values(it usually does!). I got (20-30(sqrt2))/23

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9. (Original post by Mutleybm1996)
Can I quickly ask how to do part c? My calculator is not giving me exact values(it usually does!). I got (20-30(sqrt2))/23

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That's not correct. Can you post your working for this one?
10. sorted

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11. (Original post by Mutleybm1996)
sorted

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Yoi can set the thread to "answered" if you like. There's no need for the thread to be closed.

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