6.6 9th april 2013
TRANSCRIPT
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6.6 Combined Trig Transformations
When looking at multiple transformations on a trig graph, the form is :
y=a sin(b(xh))+k
a: amplitude (vertical stretch) fromk: vertical shiftb: no. of cycles in (for sine and cosine)h: horizontal shift
Remember that When given the equation we can
therefore find the period size.
By manipulating this statement we also get When
given the graph and determining the period we can thereforefind the b value to write the equation.
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Ex)
What is the period and draw a sketch of :
y=cos(4x)
Find the b value to help write the equation of this graph.
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The easiest way to sketch a trig graph after multiple transformationsis to:1) analyze the vertical shift2) apply the vertical stretch (amplitude) to this shift3) determine the horizontal shift as a starting point of the trig function.Remember that sine starts in "the middle" while cosine starts at "the top".4) Use "b" to determine "p" to draw a complete cycle of the function
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Let's begin by sketching some trig functions with only2 transformations. Use the supplied graph paper.
a) y=3sin(x) + 2
b) y=4cos(x) 1
c) y=5sin(2x)
d) y=cos2(x )
e) y=sin (3x6) This one has an issue!
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a=_________
b=______ p=_______
c= ________
d= ________
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Now let's work from a given graph back to an equation.Determine the values of a, b, h, and k, and substitue intothe general form of the trig equation.
NOTE: You can use either sine or cosine, and can alsoreflect them to fit the graph.
a= ____________
p=_____ b=________
h= ___________
k= ___________
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a=
b= p=
h=
k=
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Write this graph as BOTH a sine and a cosine function!
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HOMEWORK: Pg. 535 #4, 5, 6,7, 8a), 9a) 10 (for sketching in 10, draw one complete cycle)