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I think I know how to solve this, but could someone please check my work for me?
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I think I know how to solve this, but could someone please check my work for me?

I think I know how to solve this, but could someone please check my work for me?-example-1
User Michael Mulqueen
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answer is :

cos⁻¹[(-1-4√7)/(√17, √8) = 173.33° ≈ 173°

User Delameko
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