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GCSE Maths Notes
Equation of A+Bsinx or A+Bcos x From a Graph
Equation of A+Bsinx or A+Bcos x From a Graph
Given a graph of the form
\[y=A+B cos x, \: A+B sin x\]
, shown below,
We can easily find
\[A\]
and
\[B\]
\[A=\frac{y_{MAX}+y_{MIN}}{2}=\frac{7+3}{2}=5\]
\[A=\frac{y_{MAX}-y_{MIN}}{2}=\frac{7-3}{2}=2\]
The equation of the graph is
\[y=5+2 cos x\]
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