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vesna_86 [32]
3 years ago
12

S9 for 40+30+20+ S9=

Mathematics
1 answer:
Pani-rosa [81]3 years ago
3 0
Well I know 40+30+20= 90. If that is not what you are looking for then you need to clarify what you are asking.
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\bf \textit{Sum and Difference Identities}
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