If tan = x/y, x > 0, y > 0, and 0 < < /2,

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If tan α = x/y, x > 0, y > 0, and 0 < α < π/2, then what is cos α?

F. √x2 + y/ y
G. y / √x+ y2
H. x / x+ y2
J. y/x
K. x/y

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