Sketching Graphs (VCE SSCE Mathematical Methods): Flashcards

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Sketching graphs
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Term for horizontal shifts in trig functions

Phase shifts

Name of ε\varepsilon in y=asinn(t±ε)y = a\sin n(t \pm \varepsilon)

Phase

Direction of shift for y=sin(tε)y = \sin(t - \varepsilon)

Right by ε\varepsilon units

Direction of shift for y=sin(t+ε)y = \sin(t + \varepsilon)

Left by ε\varepsilon units

Period of y=asin(nt)y = a\sin(nt) or y=acos(nt)y = a\cos(nt)

2πn\frac{2\pi}{n}

What a|a| represents in y=asin(nt)y = a\sin(nt)

Amplitude

Range of y=asin(nt)y = a\sin(nt) without vertical shift

[a,a][-|a|, |a|]

Range of y=asin(nt)+by = a\sin(nt) + b

[a+b,a+b][-|a| + b, |a| + b]

Effect of +b+b in y=asin(nt)+by = a\sin(nt) + b

Shifts graph up by bb units

Method to find x-intercepts of trig function

Set y=0y = 0 and solve

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