exam Maths Puzzle Numerical Ability

Please help me, I'm struggling!
Find the exact value of:
(1/cos^2 40 degrees)-(1/cot^2 40 degrees)

Thank you for your time, Natalie

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exam Other Question

how would i do this? Simplify the following fraction by putting it in lowest terms or by performing the indicated operation.

4x2-4x+1 over 8x3-1
Simplify:
log(base 2)8 + 3 log(base 3)3 - log(base 2)1 + log(base 4)(1/4)