How to find all double expressions added to a very long formula?

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Hamza Yusuf
Hamza Yusuf 2020-11-12
Given a large formula how do i find all expressions multiplied by two terms such as.
syms m1 m2 l1 l2 thetadotdot1 thetadotdot2 thetadot1 thetadot2 theta1 theta2 g; n=1;
t1=m2*l2^2*(thetadotdot1+thetadotdot2)+m2*l1*l2*cos(theta2)*(2*thetadotdot1+thetadotdot2)+(m1+m2)*l1^2*thetadotdot1-m2*l1*l2*sin(theta2)*(thetadot2^2)-2*m2*l1*l2*sin(theta2)*(thetadot1*thetadot2)+m2*l2*g*cos(theta1+theta2)+(m1+m2)*l1*g*cos(theta1);
The output should be
-2*m2*l1*l2*sin(theta2)
Where the coeficient is
(thetadot1*thetadot2)
Currently I am using this method:
feval(symengine, 'coeff', t1, thetadot1,n)/thetadot2;
But I want a better bethod that this, as this might not work for all cases.

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