how to use plot?

syms x
th=[0:0.05:1.57];
[x]=solve('cos(th+x)=0','x')

i wanna show graph about x-axis--->th,y-axis--->x

i use function solve.

but it calls just

x =

pi/2 - th

i want vector x that extracted by th.

then i wanna see plot at x-axis--->th,y-axis--->x

how to i solve it?

thank you for reading

Answer 1

[Paulo Silva]

Maybe this

syms x 
th=[0:0.05:1.57]; 
[x]=solve('cos(th+x)=0','x');
f=subs(x,'th',th);
plot(th,f,th,cos(th),'r')
legend('f','cos(th)')