• 2021 April(Z04) Math Question 58

    Trigonometry

    - Graphing Trig Functions

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

    $$ y = A \ cos(B(x + C)) + D $$

    $$ Amplitude = 3=> A=3 $$

    $$ Period=π=\frac{2π}{B} => B=2 $$

    $$ No \ shifts => C=0,\ D=0 $$

    $$ \therefore y = 3 \ cos(2(x + 0)) + 0= 3 \ cos(2x) $$

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