book Maths Puzzle Numerical Ability

I have a trig. problem that I hope someone can help me with.
Sec2Csc2 - Sec2 - Csc2 + 1

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book Other Question

(4 - y)(-9) FOr a fixed rate, a fixed principal amount, and a fixed compounding cycle, the return is an exponential function of time. Using the formula, A=P(1 +r/n)nt, let r=8%, P = 1, and n = 1 and give the coordinates (t,A) for the points where t = 0,1,2,3,4.