Solve the equation
cos cos
State your answers as multiples of .
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Solve the equation
cos cos
State your answers as multiples of .
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An exponential model of the form is used to model the amount of a pain-relieving drug (D mg/ml) there is in a patient’s bloodstream,
hours after the drug was administered by injection.
and
are constants.
The graph below shows values of
plotted against
with a line of best fit drawn.
(i) Use the graph and line of best fit to estimate at time
.
(ii) Work out the gradient of the line of best fit.
Use your answers to part (a) to write down an equation for the line of best fit in the form , where
and
are constants.
Show that can be rearranged to give
Hence find estimates for the constants and
.
Find the time when the amount of the pain-relieving drug in the patient’s bloodstream is 1.5 mg/ml.
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The diagram below shows the graph of , where
is the function defined by
The points A and B are maximum and minimum points, respectively.
Find the difference between the -values of the coordinates of
and
, giving your answer correct to 3 decimal places.
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On the same axes, sketch the graphs of and
where
Label the points at which the graphs intersect the coordinate axes.
Solve the equation .
Which of the solutions to is also a solution to
?
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The minimum point on the graph of has coordinates
as shown on the diagram below.
Sketch the graph of and state the coordinates of the maximum point.
Find the exact distance between the minimum point on the graph of and the maximum point on the graph of
.
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Show that, for (where k is an integer),
Use calculus and your result from part (a) to show that
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The village of Crinkley Bottom lies on a straight road, as modelled by the line on the graph below. Rush hour traffic causes much air pollution in the village so to improve the air quality around Crinkley Bottom a bypass is to be built.
The path of the bypass is modelled by part of the equation .
The bypass is to be built with a roundabout south of the village at the origin and a northern roundabout which re-joins the road through Crinkley Bottom at the point .
On the diagram show how using the iterative formula with
will lead to convergence at the southern roundabout
Use the alternative iterative method
with , to find the position of the roundabout at P to four significant figures.
Verify that your answer to part (b) is correct to four significant figures.
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Show that cos
sin
can be written in the form
cos
, where
and
is an acute angle measured in radians.
Hence, or otherwise, solve the equation cos
sin
,for
Give your answers to three significant figures.
Write down the minimum value of cos
sin
and the smallest positive value of
for which it occurs. Give your value of
to three significant figures.
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Differentiate with respect to x, simplifying your answers as far as possible:
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A is the point on the graph of such that the tangent to the graph at
passes through the point
. Show that the x-coordinate of A satisfies the equation
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It is given that
where and
are integers.
Find the values of .
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Show that there are no positive values of and
that satisfy the equation
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