The point (4,z) lies on the terminal side of the angle. Find sinX, cosX, and tanX

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Mathematics

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The point (4,z) lies on the terminal side of the angle. Find sinX, cosX, and tanX

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Explanation & Answer

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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)

Then,

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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