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Mathematics, 09.09.2021 02:00 shubbs1038a

I think the equation is $b^{2}=10^{2}+130^{2}-2\left(10\right)\left(130\right)\cos40$ but please give me the right equation/answer <3

I think the equation is

but please give me the right equation/answer <3

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I think the equation is but please give me the right equation/answer <3
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