solve usin indenititiess. (algebra exporession chp)
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118 × 118 - 82 × 82
200
.
= 118^2 - 82^2
200
= (118 + 82) (118 - 82) (a^2 - b^2 = (a+b) (a-b)
200
= 200 × 36
200
= 36
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