exam Maths Puzzle Numerical Ability

can you help me: Simplify and state all excluded values.
(4k^2 - 25)/(4k^2 _ 20k + 25)

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exam Other Question

tan^2x-cot^2x=sec^2x-csc^2x To analyze data cross-classified in a contingency table, how are the degrees of freedom found?
A) N�1
B) Rows � Columns
C) (Rows) x (Columns)
D) (Rows � 1) x (Columns � 1)
E) None of the above