book Maths Puzzle Numerical Ability

This one is also from my worksheet... I appreciate any help. : )
Write a polynomial of least degree which has the indicated zeros.
-1,6i,-6i

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book Other Question

What is the completely factored form of 25x^4-4x^2? cosx+cosy-cos(x+y)=3/2

this is only possible if x=y=60