Author Topic: [sovled] How do i sketch this. (Read 1563 times) Tweet Share

99.96 · « **on:** October 23, 2011, 02:15:51 pm »

solved.
thanks to tony's solution.

Natters · « **Reply #1 on:** October 23, 2011, 02:23:07 pm »

is there meant to be an i in front of the z and whats ur z and im pretty sure when it says the argument is less than 45* you dont draw it in a circle as the magnitude is like undefined or whatever

99.96 · « **Reply #2 on:** October 23, 2011, 02:33:41 pm »

Yea there is meant to be an i in front of the z. And i have no idea why i drew a circle, fixed it.

Special At Specialist · « **Reply #3 on:** October 23, 2011, 02:57:34 pm »

You started with Arg(iz) ≤ pi/4 and then:
Arg(z) + Arg(i) ≤ pi/4
Arg(z) + pi/2 ≤ pi/4
Arg(z) ≤ -pi/4
Since -pi ≤ Arg(z) ≤ pi:
-pi ≤ Arg(z) ≤ -pi/4

So it all seems to be correct.

yawho · « **Reply #4 on:** October 23, 2011, 03:22:42 pm »

-3pi/2 < arg(z) <= -pi/4

99.96 · « **Reply #5 on:** October 23, 2011, 04:09:45 pm »

Quote from: yawho on October 23, 2011, 03:22:42 pm

-3pi/2 < arg(z) <= -pi/4

This is apparently the correct answer, mind telling me how you got there?

tony3272 · « **Reply #6 on:** October 23, 2011, 04:16:40 pm »

Dont you go:

$-\pi <Arg(iz)\leq \frac{\pi}{4}$

$-\pi <Arg(z)+Arg(i)\leq \frac{\pi}{4}$

$-\pi <Arg(z)+\frac{\pi}{2}\leq \frac{\pi}{4}$

$-\frac{3\pi}{2}<Arg(z)\leq -\frac{\pi}{4}$

99.96 · « **Reply #7 on:** October 23, 2011, 04:24:40 pm »

^^^^ ahhh yea that makes sense cheers.

yawho · « **Reply #8 on:** October 23, 2011, 08:44:24 pm »

arg, not Arg

Search the forums now!

We have moved!

Author Topic: [sovled] How do i sketch this. (Read 1563 times) Tweet Share

99.96

[sovled] How do i sketch this.

Natters

Re: How do i sketch this.

99.96

Re: How do i sketch this.

Special At Specialist

Re: How do i sketch this.

yawho

Re: How do i sketch this.

99.96

Re: How do i sketch this.

tony3272

Re: How do i sketch this.

99.96

Re: How do i sketch this.

yawho

Re: How do i sketch this.

Recent Posts

User:
Password: