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प्रश्न
Use the direct method to evaluate :
`("z"-2/3)("z"+2/3)`
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उत्तर
Note: (a+b) (a−b) = a2 − b2
`("z"-2/3)("z"+2/3)=("z")^2-(2/3)^2`
`="z"^2-4/9`
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