Factor and simplify please?

Question

#3cos^2(x)+cos(x)-4#

Thank you

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Answer 1 · 2017-12-03T18:35:09

Factor #3c^2+c-4 = (3c+4)(c-1)#

So,

#3cos^2x+cosx-4 = (3cosx+4)(cosx-1)#

That is factored.
I don't understand the request to simplify this.