exam Maths Puzzle Numerical Ability

((2x^2-8)/(2x^2-x-1)/(8x^2-12x-8)/(x^2-1))

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exam Other Question

Verify the identy:

1+tan�x
------- =csc�x
tan�x Given a right triangle ABC, with angle A = 90degrees and AB=4, AC=6, find the length of altitude AD.