Cos2a=1-2sin^2a for all values of a.
2 answers:
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The graph is a linear graph
The equation of a linear graph is given in the form
where 
is the gradient and 
is the y-intercept
To find gradient:
Choose any two coordinates that lie on the line.
We choose (4,7) and (0, 10)
the graph crosses the y-axis at 10, so the value of
Forming the equation
Answer: D
The equation of a linear graph is given in the form
To find gradient:
Choose any two coordinates that lie on the line.
We choose (4,7) and (0, 10)
the graph crosses the y-axis at 10, so the value of
Forming the equation
Answer: D