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# My homework is on finding maximum and minimum values and critical points in a function. Is g( )= 4 -tan differentiable everywhere?

My homework is on finding maximum and minimum values and critical points in a function. Is g(**θ)=**4**θ-tanθ differentiable everywhere? I know the derivative of g(θ)= 4-csc^2(θ) but from there I dont know how to break this down where g'(θ)=0**