The point (4,z) lies on the terminal side of the angle. Find sinX, cosX, and tanX
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4 and z form the legs of a right triangle where 4 is the horizontal leg and z is the vertical leg.
Therefore the hypotenuse is sqrt(4^2 + z^2) = sqrt(16+z^2)
sinX = opp/hyp = z / sqrt(16+z^2)
cosX = adj/hyp = 4 / sqrt(16+z^2)
tanX = opp/adj = z/4
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