Factorise (a + b)' – (a - b)'
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(a + b) - (a - b)
Remove unnecessary parentheses
a + b - (a - b)
when there is a - front of an expression in parentheses
change the sign of each term in the expression
a + b - a + b
Since two opposite add up to zero remove them from
the expression
b + b
Collect like terms
2b
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