Original post by BigBadJFly
Hey guys,
Does 1/i equal -i?
If so why?
Does 1/i equal -i?
If so why?
You know that right? If not, it can easily be proved by basic power rules or induction.
It should be easy from there
.
Original post by BigBadJFly
Hey guys,
Does 1/i equal -i?
If so why?
Does 1/i equal -i?
If so why?
Here you go mate and yeah 1/i equals to -i
Thanks! 
Original post by BigBadJFly
Thanks!
No prob. What grade does that come under at Further Maths ?
Original post by Arithmeticae
You know that right? If not, it can easily be proved by basic power rules or induction.
It should be easy from there.
It should be easy from there
.How does that even help OP's question?
Original post by JAIYEKO
How does that even help OP's question?
Unparseable latex formula:
.\begin{aligned} i^n &= i^{n+4} \\ \implies i^{-1} &= i^3 \\ &= i^2 \cdot i \\ &= -i
That OK brah?
(edited 9 years ago)
Original post by Arithmeticae
Unparseable latex formula:
.\begin{aligned} i^n &= i^{n+4} \\ \implies i^{-1} &= i^3 \\ &= i^2 \cdot i \\ &= -i
Nice mate how did you get that don't btw?
Original post by JAIYEKO
Nice mate how did you get that don't btw?
What are you talking about? What "don't"?
Original post by Arithmeticae
What are you talking about? What "don't"?
I meant to say, how did you get that font for your workings out mate? And does my method work well?
Original post by JAIYEKO
I meant to say, how did you get that font for your workings out mate? And does my method work well?
It's called .
It's fine, I prefer the other way, but it'll do.
Alternatively, you could consider a rotation in the complex plane (multiplying by i produces 90° rotation anticlockwise which implies a division by i gives a 90° clockwise rotation.)
Posted from TSR Mobile
Original post by JAIYEKO
No prob. What grade does that come under at Further Maths ?
I needed it in the june 06 FP2 paper
Original post by BigBadJFly
I needed it in the june 06 FP2 paper
Yeah I know I mean in terms of complexity how hard is it in FM terms?
A*,A,B,C,D?
Original post by JAIYEKO
Yeah I know I mean in terms of complexity how hard is it in FM terms?
A*,A,B,C,D?
A*,A,B,C,D?
errr... I dunno, maybe A, was only worth 1 mark.
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