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