7B) Unsure on the last stage of this question as I'm left with:
to get to Sec^2x=25
cosec^2x = 1 + cot^2x
so you have -2(1+cot^2x)/-cot^2x=50
You can get rid of the negatives as they are on both the top and bottom
The sin^2x cancel out to give you:
Hope that makes sense
EDIT: You could also go from
2cosec^2x/cot^2x to 2(1/sin^2x)/cos^2x/sin^2x
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