Why doesn't this code solve the equation?

2017 3 10
1 个回答
更新时间：2021 8 20
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Hi, I am trying to solve a trigonometric equation for phis using the following code:
phi = linspace(0,3*pi/4,1000);
syms phis
sol=solve(sqrt(108-40*sqrt(2)*cos(phi-phis))/sin(phi-phis)==10/sin(phis),phis);
double(subs(sol))
Unfortunately it doesn't work. Any idea how to fix it?

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Yuval
Yuval
2017-3-10

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