Answer - trigonometric equation

[toya29]

Hi. When i try to solve a trigonometric equation. I'm not sure how to receive the answers in terms of pi and n. for example:

solve(sin(x)=0) = {0, pi}

but i want receive {n*pi}

My firmware is 10637 (29/08/2016)

thanks .

[Steve Keeley]

Go into settings and turn off "Principal:"

[compsystems]

CAS Settings: Principal Solution: [OFF]

solve( sin(x)= 0, x) ;
[enter] returns
{n_0*π} // ok

but
Ans[1]|(n_0 = 1) not evaluated, Why?




.

[Han]

(10-14-2016 05:05 AM)compsystems Wrote:  CAS Settings: Principal OFF

solve( sin(x)= 0, x) ;
[enter] returns
{n_0*π} // ok

but
(Ans[1]|(n_0 = 1)) not evaluated, Why?

This may be due to the priority of the | (where) operator. The (literal) expression "Ans[1]" does not contain any references to n_0 so that substitution does nothing. After evaluation of Ans[1], you get the unevaluated result because the evaluation of n_0 = 1 happened before the evaluation of Ans[1].

There was an old thread discussing this a while back...

[parisse]

You don't need | in CAS,
s:=solve(sin(x)=0);
s(1)(n_1=1)