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Given z(1)=4-7i and z(2)=5+6i find the a...

Given `z_(1)=4-7i` and `z_(2)=5+6i` find the additive and multiplicative inverse of `z_(1)+z_(2)` and `z_(1)-z_(2)`.

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The correct Answer is:
`-(1)/(1+13i)`
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