Does it have extra information or missing information

I would say it has extra information. All you need to really know is that she's going to type 500 words. The info about writing the essay in 5 hours and how many pages is not needed. To solve, I would divide 500 by 60, which is 8.3 repeating, or just 8.3, so it'd take 8.3 minutes to type it up. Please correct me if I'm wrong!

2cos2x=y

dy/dx(2cos2x)=-4sin2x

d/du cosu= u'×cos'u=-u'×sinu

d/du sinu= u'×sin'u= u'×cosu

d/du tanu = u'×(1+tan²u)

d/du cotu = u'×-(1+cot²u)

proof for cosu :

cos2x= 1-2sin²x

or 2cosx²-1

or cos²x-sin²x

we will one of this fro example let's take the first one

d/dx 1-2sin²x=0-2×2(sinx)×cosx=-2sin2x

and we have 2 in the begining so its -4sin2x