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Graphing Tangent

Graphing Tangent. Objective: To graph the tangent function. y = tan x. Recall from the unit circle: that tan  = tangent is undefined when x = 0. y=tan x is undefined at x = and x =. Domain/Range of the Tangent Function. The tangent function is undefined at + k  .

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Graphing Tangent

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  1. Graphing Tangent • Objective: • To graph the tangent function

  2. y = tan x • Recall from the unit circle: • that tan  = • tangent is undefined when x = 0. • y=tan x is undefined at x = and x = .

  3. Domain/Range of the Tangent Function • The tangent function is undefined at + k. • Asymptotes are at every multiple of + k . • The domain is (-,  except + k ). • Graphs must contain the dotted asymptote lines. These lines will move if the function contains a horizontal shift, stretch or shrink. • The range of every tan graph is (-, ).

  4. Period of Tangent Function • One complete cycle occurs between and . • The period is .

  5. Critical Points • The range is unlimited; there is no maximum or minimum.

  6. Parent Function y = tan x Key Points • : asymptote. The graph approaches - as it near this asymptote • Key points ( , -1), (0,0), (, 1) • : asymptote. The graph approaches  as it nears this asymptote

  7. Graph of the Parent Function

  8. Parent Function: (-,)

  9. The Graph: y = a tan b (x - c)+ d • a = vertical stretch or shrink • If |a| > 1, there is a vertical stretch. • If 0<|a|<1, there is a vertical shrink. • If a is negative, the graph reflects about the x-axis.

  10. y = 4 tan x

  11. y = a tan b (x - c) + d • b= horizontal stretch or shrink • Period = • If |b| > 1, there is a horizontal shrink. • If 0 < |b| < 1, there is a horizontal stretch.

  12. y = tan 2x

  13. y = a tan b (x - c) + d • c = horizontal shift • If c is negative, the graph shifts left c units. (x - (-c)) = (x + c) • If c is positive, the graph shifts right c units. (x - (+c)) = (x - c)

  14. y = tan (x - /2)

  15. y = a tan b (x-c) + d • d= vertical shift • If d is positive, graph shifts up d units. • If d is negative, graph shifts down d units.

  16. y = tan x + 3

  17. To Find Asymptotes

  18. y = 3 tan (2x-) - 3

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