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Find the product of the following binomi...

Find the product of the following binomials: `(a^2+b^2)(-a^2+b^2)` `(-a+c)(-a-c)`

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(i) `(a^2+b^2)(-a^2+b^2)`
`=a ^2 (a+b ^2 )+b(a+b ^2 )`
`=a^3 +a^2 b^2 +ab+b^3`

(ii) `(-a+c)(-a-c)`
`=a^2+ac-ac-c^2`
`=a^2-c^2`
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