exam Maths Puzzle Numerical Ability

How do I go about finding the exact value of tan(pi/4-pi/3)?

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exam Other Question

what is the meaning of function and relation? Given A = 7 (neg) -2 1
3 5 0
-1 4 (neg)-6

I say neg becaues it is not minus the #

and B =
2 (neg)-3 neg -4
6 0 neg -2

-5