EPQP's answer to Nicole's Junior College 2 H2 Maths Singapore question.
Note that there's a typo where the exponential form is raised to power of 11, it should be -2π/3 instead of -π/3.
How does t=(x+y)/2 ?
First, add the two equations from earlier to eliminate the (1/t)s. This leave u with a simple x, y and t expression, and you can make t the subject accordingly.
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