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Graphs of Tangent and Cotangent Functions

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2 Plan for the Day Review Homework Graphing Tangent and Cotangent Homework

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3 Key Steps in Graphing Sine and Cosine Identify the key points of your basic graph 1.Find the new period (2π/b) 2.Find the new beginning (bx - c = 0) 3.Find the new end (bx - c = 2π) 4.Find the new interval (new period / 4) to divide the new reference period into 4 equal parts to create new x values for the key points 5.Adjust the y values of the key points by applying the amplitude (a) and the vertical shift (d) 6.Graph key points and connect the dots

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4 Key Steps in Graphing Secant and Cosecant 1.Identify the key points of your reciprocal graph (sine/cosine), note the original zeros, maximums and minimums 2.Find the new period (2π/b) 3.Find the new beginning (bx - c = 0) 4.Find the new end (bx - c = 2π) 5.Find the new interval (new period / 4) to divide the new reference period into 4 equal parts to create new x values for the key points 6.Adjust the y values of the key points by applying the amplitude (a) and the vertical shift (d) 7.Using the original zeros, draw asymptotes, maximums become minimums, minimums become maximums… 8.Graph key points and connect the dots based upon known shape

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5 Tangent and Cotangent Look at: Shape Key points Key features Transformations

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Graph Set window Domain: -2π to 2π x-intervals: π/2 (leave y range) Graph y = tan x 6

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7 y x Graph of the Tangent Function 2. range: (–, + ) 3. period: 4. vertical asymptotes: 1. domain : all real x Properties of y = tan x period: To graph y = tan x, use the identity. At values of x for which cos x = 0, the tangent function is undefined and its graph has vertical asymptotes.

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8 Graph y = tan x and y = 4tan x in the same window What do you notice? y = tan x and y = tan 2x What do you notice? y = tan x and y = -tan x What do you notice?

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Graph Set window Domain: 0 to 2π x-intervals: π/2 (leave y range) Graph y = cot x 9

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10 Cotangent Function Graph of the Cotangent Function 2. range: (–, + ) 3. period: 4. vertical asymptotes: 1. domain : all real x Properties of y = cot x y x vertical asymptotes To graph y = cot x, use the identity. At values of x for which sin x = 0, the cotangent function is undefined and its graph has vertical asymptotes.

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11 Graph Cotangent y = cot x and y = 4cot x in the same window What do you notice? y = cot x and y = cot 2x What do you notice? y = cot x and y = -cot x What do you notice? y= cot x and y = -tan x

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12 Key Steps in Graphing Tangent and Cotangent Identify the key points of your basic graph 1.Find the new period (π/b) 2.Find the new beginning (bx - c = 0) 3.Find the new end (bx - c = π) 4.Find the new interval (new period / 2) to divide the new reference period into 2 equal parts to create new x values for the key points 5.Adjust the y values of the key points by applying the amplitude (a) and the vertical shift (d) 6.Graph key points and connect the dots

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