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## Homework Statement

Find the general solution for

Y''+16y=sec4x

## Homework Equations

I was thinking of using annihilator method to find Yp, but I do not know how to annihilate inverse trig functions, only sine and cosine.

Is there a better approach to this to find Yp? Finding the complementary is easy enough.

But, figuring out which method to use to find Yp is always the hardest part of the problem for me.

Thanks,