The sketch below shows part of the graph of $y = a \cos(bx) + c$, where $x$ is in degrees.

Question

The sketch below shows part of the graph of $y = a \cos(bx) + c$, where $x$ is in degrees. Write down the values of $a$, $b$ and $c$. When $x = 45^\circ, y = 3.5$. Use the sketch to write down two further values of $x$ between $0$ and $405$ for which $y = 3.5$.

Accepted Answer

(i) $a=3$, $b=\frac{4}{3}$, $c=2$ (ii) $225^\circ$, $315^\circ$

Trigonometry - Trigonometric Graphs and Parameters

Trigonometry - Trigonometric Graphs and Parameters

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