Answer:
Answer is D
Hope this helps you
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As we can see, this is a 45 45 90 triangle
The legs of the triangle are equal and the hypotenuse = leg * sqrt(2)
In this case,
The hypotenuse = 6 * sqrt(2)
Cos(45) = 6 / (6 * sqrt(2))
The 6's cancel each other out and you're left with:
1 / sqrt(2)
