exam Maths Puzzle Numerical Ability

Sketch the angle with measure (-2π)/3 radians. Then label its reference angle.

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exam Other Question
find the exact solutions to 5x^2+17x+6=0 p.16 #23
I cannot figure out how to create an equation from the following complex numbers
a) 2+i and 2-i
b) 3+2i and 2-3i

thaks!