Anybody good at mathematics?

[Lee]

Can anybody just verify if I am right in thinking the following little equation is correct?

When working with real and imaginary numbers in polar form I am right in thinking that you times or divide the real part and add or subtract the imaginary part, yes?

 

[intradox]

Have you tried WolframAlpha.com? (100L20°)/(2L60°)

http://www.wolframalpha.com/input/?i=(100L20°)/2L60°)&a=*MC.L20-_*Unit.dflt-&a=UnitClash_*L.*Lamberts--&a=UnitClash_*°.*AngularDegrees.dflt--

edit: oops wrong one. Pretty sure this is what you're looking for:
Pretty sure your answer is correct just need to move the 40 back down for the "proper" notation.

http://www.wolframalpha.com/input/?i=(100L20°)/(2L60°)&a=*MC.L20-_*ConcatPower-&a=UnitClash_*L.*Liters.dflt--&a=UnitClash_*°.*AngularDegrees.dflt--

 

[Ingenious]

Can anybody just verify if I am right in thinking the following little equation is correct?

When working with real and imaginary numbers in polar form I am right in thinking that you times or divide the real part and add or subtract the imaginary part, yes?

View attachment 42950

I managed to follow this up until the word "Can"

 

[Sim]

When working with real and imaginary numbers in polar form

What on earth are you studying that needs you to work with numbers in polar form?

Not something you come across very often (read: ever!).

 

[Lee]

What on earth are you studying that needs you to work with numbers in polar form?

Not something you come across very often (read: ever!).

Electronics. We use them a lot to work out impedances of electronic components.

 

[Lee]

Just for the record my answer up there is correct

 

[Biker]

Whew! Thank goodness. Because I still have issues with 1+2 (It's 4, by the way).

 

[kkm323]

I thought math was my thing

 

[Alien]

I can count to potato...

 

[SilverCircle]

Can anybody just verify if I am right in thinking the following little equation is correct?

package foo.bar;
import org.apache.commons.math3.complex.*;
import org.apache.commons.math3.util.FastMath;
 
public class Main {
 
    public static void main(String[] args) {
        Complex p1 = ComplexUtils.polar2Complex(100, FastMath.toRadians(20));
        Complex p2 = p1.divide(ComplexUtils.polar2Complex(2, FastMath.toRadians(60)));
 
        double theta = FastMath.atan(p2.getImaginary() / p2.getReal());
        double mag = FastMath.sqrt(p2.getImaginary() * p2.getImaginary() + p2.getReal() * p2.getReal());
 
        System.out.println(mag + "L" + FastMath.toDegrees(theta));
    }
}

Output:

50.0L-40.00000000000000

So, yeah, you're right - and yes, I'm in idle mode (not sayin' I'm bored), but this took only a couple of minutes anyway

 

[Lee]

package foo.bar;
import org.apache.commons.math3.complex.*;
import org.apache.commons.math3.util.FastMath;
 
public class Main {
 
    public static void main(String[] args) {
        Complex p1 = ComplexUtils.polar2Complex(100, FastMath.toRadians(20));
        Complex p2 = p1.divide(ComplexUtils.polar2Complex(2, FastMath.toRadians(60)));
 
        double theta = FastMath.atan(p2.getImaginary() / p2.getReal());
        double mag = FastMath.sqrt(p2.getImaginary() * p2.getImaginary() + p2.getReal() * p2.getReal());
 
        System.out.println(mag + "L" + FastMath.toDegrees(theta));
    }
}

Output:

So, yeah, you're right - and yes, I'm in idle mode (not sayin' I'm bored), but this took only a couple of minutes anyway

thanks very much!