9 years, 92 days

## An unexpected solve bug...

Maple 2021

Hi,

here a problem when i solve equations.i guess solve lost a root.how can i do.

## how simplify(arctan(cos(beta)/sin(beta)...

Maple 2019

how I can I get MAPLe to simplify this to Pi/2-beta ,

simplify(arctan(sin(beta)/cos(beta)),arctrig) assuming beta<Pi/2,beta>0;

simplify(arctan(sin(beta)/cos(beta)),symbolic) assuming beta<Pi/2,beta>0;

why i can't get Pi/2-beta

## how do i select different literal subs...

Maple 2017

for example, a__b+b__a+a__b^2,how i can choose the first and third.

## How to simplify certain terms of it?...

Maple 2015

hi,

here a comlicated formula,how i simplify

thanks  a lot.

 >
 (1)
 >
 (2)
 >

f is a complicated function,i want to make it more simplify,but i want to keep square style,

let coefficients of X and Y keep one unit,and simplify terms  containd special symbol of omega

it what i wanted.

## How to solve a PDE?...

Maple 2015

Hi,

i meet  a partial differential equation seems not complicated

with(PDEtools):

PDE := (diff(f(x__1, x__2, p__1, p__2), x__1))*p__1/m-(diff(f(x__1, x__2, p__1, p__2), p__1))*(2*k*x__1-k*x__2)+(diff(f(x__1, x__2, p__1, p__2), x__2))*p__2/m-(diff(f(x__1, x__2, p__1, p__2), p__2))*(-k*x__1+2*k*x__2);

when i use

pdsolve(PDE);

i get nothing,but i sure

f=c*(p__1^2/m+p__2^2/m+4*p__1*p__2/m+6*k*x__1*x__2)

is the one solution of the differential equation .

how i can get solutions about of the above equation.

thanks .

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