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I have posted a link there to this topic so the OP can see my work.Differential Equations HW HELP!?

13. y'' + y = sec(t), 0< t < π/2; y = (cos t) ln cos t + t sin t

In each of Problems 7 through 14, verify that each given function is a solution of the differential equation.

I'm currently trying to review derivatives, but trig derivatives are super hard. Help?