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Tcecarenko [31]
2 years ago
9

Helppp i literally dont understand this at all

Mathematics
1 answer:
Ksju [112]2 years ago
3 0

Answer:

D. Substitution

Step-by-step explanation:

I don't know how to explain it other than that they substituted the 50° angle into the original equation.

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➶ Hope This Helps You!

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