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