How do i write theses equations in matlab?

x''=0.0454((theta')^2)sin(theta)+90.1sin(10t)-90.1x-(cos(theta))[((theta')^2)(-1.363sin(theta)^2 -.5cos(theta))-545.454sin(10t)+545.454x+58.86cos(theta)]/(22+66sin(theta)cos(theta)-60cos(theta))

theta=x(3) and theta'=x(4)

i keep getting an error whenever i put it in, so maybe someone here will know how to type it.

[Ameer Hamza]

It is very difficulyCan you give actual equation in picture form. It is very difficut to understand like this. Also, what are x(3) and x(4)?