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Mathematics
Mathematics
Problem
Identify the trigonometric function that equals
1
−
2
sin
2
θ
1-2\sin^{2}\theta
1
−
2
sin
2
θ
for all real
θ
\theta
θ
. a)
−
cos
2
θ
-\cos 2\theta
−
cos
2
θ
b)
sin
2
θ
\sin 2\theta
sin
2
θ
c)
cos
2
θ
\cos 2\theta
cos
2
θ
d)
cos
2
θ
\cos^{2}\theta
cos
2
θ
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