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Mathematics
Mathematics
Problem
Which of the following represents
cos
2
θ
\cos^2\theta
cos
2
θ
in terms of
2
θ
2\theta
2
θ
? a)
1
−
cos
2
θ
2
\dfrac{1-\cos2\theta}{2}
2
1
−
cos
2
θ
b)
1
+
sin
2
θ
2
\dfrac{1+\sin2\theta}{2}
2
1
+
sin
2
θ
c)
1
+
cos
2
θ
2
\dfrac{1+\cos2\theta}{2}
2
1
+
cos
2
θ
d)
cos
2
θ
2
\dfrac{\cos2\theta}{2}
2
cos
2
θ
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