• 2021 April(Z04) Math Question 58

    Trigonometry

    - Graphing Trig Functions

    Amplitude, Period, Phase Shift and Frequency, Graphs of Sine, Cosine and Tangent
    Choice K

    y=A cos(B(x+C))+D

    Amplitude=3=>A=3

    Period=π=2πB=>B=2

    No shifts=>C=0, D=0

    ∴y=3 cos(2(x+0))+0=3 cos(2x)

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