pls ans these sums I'll mark u as the brainist pls
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b) 25(a²+b²-2ab)-49(a²+b²-2ab)
25 a²+25b²-50ab-49a²+49b²-98ab
-24a²+74b²-148ab
24 a²-74b²+148 ab
c) I already simplify d it...
d) z=90 ° x=45° y=135°
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