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hidais
19.05.2020 •
Mathematics
Question #2: What is the area of the shaded region?
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Ответ:
answer-
reflection across the x-axisvertical compression by a factor of 0.1vertical translation 4 units downsolution-
the given function,
the parent cosine function is,
1. for![f(x)=-\cos x](/tex.php?f=f(x)=-\cos x)
as there is a negative sign in the cos x, so all the points with coordinate (x, cos x) becomes (x, -cos x)
∴ it is reflected over x-axis.
2. for![f(x)=-0.1\cos x](/tex.php?f=f(x)=-0.1\cos x)
as a scale factor of 0.1 (i.e < 1) is multiplied, so it is compressed by a factor of 0.1
3. for![f(x)=-0.1 \cos x -4](/tex.php?f=f(x)=-0.1 \cos x -4)
as 4 is subtracted from the f(x), so all point with coordinate (x, f(x)) becomes (x, f(x)-4)
∴ it is translated 4 units down.
therefore, a series of processes
reflection across the x-axisvertical compression by a factor of 0.1vertical translation 4 units downyield the given function from its parent function.