## 150 Reputation

1 years, 287 days

## grab term under the radical in an expres...

Maple

I need to use the fact that the expression under the radical in a larger expression is >0.

How do I programmaticaly "grab" the radical term to include it in an equation such as for example:

eq1:= b^2-4 a c>0

where lhs term would have come from a previous derivation or solution ?

Thank you...

## simplifying expression into more meaning...

Maple 2019

How can I get Maple to simplify expressions into more meaningful forms?

For example,

xc1 := -(2*Q*R1 + sqrt(4*Q^2*R1*RL - R1^2 + 2*R1*RL - RL^2))*R1/(4*Q^2*R1 + R1 - RL)

The numerator, under the radical, is more meaningful as sqrt(4 Q^2 R1 RL-(R1-RL)^2).

Similarly, the denominator can be simplified to Rs(4 Q^2+1)-RL.

How do I get Maple to get me there?

## variable substitutions...

Maple 2019

I have Maple solve a system of equations.  I then want to assign the result to the different variables for use later in the worksheet.  How do I do this?

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First, all I want to do is assign the solution value for C1 to C1.  Not being able to do this, I try to assign C1 to "different" variable c1, but the assignment is C1~=.66667* Ceq, instead of just the value of C1.  Later, I then try to substitute the value of Ceq, to get the solution for c1, and instead of just getting the value, I get  that C1= 13.33x10^-8 is assigned to C1sol, again instead of just the value, 13.33x10^-8.  How do I just assign the values to these variables instead of the expressions?

Thank you.

## complete simplification...

Maple 2019

How do I get Maple to simplify:

Io := I Cp Vin L1/(M sqrt(Cp L1))

to :  I sqrt(L1 CP) Vin/ M  ?

Furthermore, if  w = 1/sqrt(L1 *CP),  how do I get Maple to display the solution or the simplification as:

I*Vin/(w M) ?

I've t ried multiple substitutions and simplifications to no avail.

Thank you.

Jorge

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## trouble with solving system of equations...

Maple 2019

Hello, I'm new to Maple, transitioning over from Mathematica.  I have a system of equations I'm trying to solve, but am trying to substitute values for some of the variables.  I don't think I'm doing it right, because I don't see the value in place of the variable when it echos the expression. Here are my equations, and how I'm trying to solve them:

wres := sqrt(C1+C2)/sqrt)C1*C2*L1)

vores := -C1/C2*vin

z3 = (C1^2 *R1- j*sqrt(C1*C2*L1*(C1+C2)))/C2^2

sys :={wres=13.56e6*2*pi, C1=C2, z3=40,abs(vores/vin)>=1}

solve(sys, {C1, C2, L1, R1})

(I apologize; I coulnd't figure out how to enter the Maple code here, directly).

When I try this, solve returns nothing.  I then try forcing R1 to be 2000, for ex.  I tried modifying sys to be

sys:={wres=13.56e6*2*pi, C1=C2, R1=2000,  z3=40,abs(vores/vin)>=1}, but this does't work.

then I tried, R1:=2000, exepcting to see R1 substituted with 2000 in the echo from sys, but it stills shows R1....

How do I do this?

Also, how do I go about investigating why solve is having trouble solving a system of equations?

Thanks

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