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What is the trigonometric ratio for cos D?

What is the trigonometric ratio for cos D?-example-1
User Megas
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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
User Khartnett
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