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Core 3 Trig Question 8



Hi,

It's (b) part (ii) that's giving me some issues.

I have found that tanφ=1/4
I have also found that cot2
φ=15/8

But, it's the tan4
φ that is giving me trouble.

Any hints...?

Thanks,

Harry
If you know what tan(2theta) is in terms of tan(theta) then you know what tan(4theta) is in terms of tan(theta).
Reply 2
Thank you! You hardly said anything and I got it. So it makes the success so much sweeter.
Reply 3
tan(4x) = tan(2x + 2x)

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