exam Maths Puzzle Numerical Ability

if (1+i)(1+sqr(3)i)/1-i=2(cos x+i sin x) find the value of x?

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exam Other Question

Crafts. A solar collector is 2.5m long by 2.0m wide. It is held in place by a frame of uniform width around its outside edge. If the exposed collector area is 2.5m^2, what is the w Given A =
3 -2 0
1 4 2
-1 5 -3
find -3A.
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