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 the integers $a$, $b$ and $c$. When $x = 20^\circ$, $y = 5.5$. Use the sketch to write down two further values of $x$ between $0$ and $180$ for which $y = 5.5$.

Accepted Answer

(i) a=3, b=3, c=4. (ii) 100 degrees and 140 degrees.

Trigonometry - Trigonometric Graphs and Parameters

Trigonometry - Trigonometric Graphs and Parameters

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