3, -23, -43, -63. find the common difference

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smartowl101

02.01.2022

Mathematics

7^2 = 6^2 + 9^2 - 2(6)(9)cos(m)
-68 = 2(6)(9)cos(m)
cos(m) = -0.6296
m = arcos ( -0.6296)
m = 129.0 degrees

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