exam Maths Puzzle Numerical Ability

PLEASE PLEASE PLEASE PLEASE PLEASE HELP ME


1. Consider the graph of y = tan x.
(a) How does it show that the tangent of 90 degrees is undefined?
(b) What are other undefin

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exam Other Question
(4,10)(2,8)(4,-7) Subtract and write in simplest form:

12 10
---- - ----
z z

I believe the answer is:
2
---
z^2

Is this correct? Thank you