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Khartnett · Answer 1 · 2019-10-25T21:41:34+0000

Hi there!

The definition of the cosine:

$\cos( \alpha ) = (adjecent)/(hypotenuse)$

When we fill in this formula with the data from the picture, we get the following:

$\cos(d) = (21)/(75) = (7)/(25)$

Therefore, the answer is 7 / 25

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