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Mathematics
Mathematics
Problem
Which of the following expressions is identically equal to 1 for every real angle
θ
\theta
θ
? a)
tan
2
θ
+
1
\tan^2\theta+1
tan
2
θ
+
1
b)
sin
2
θ
+
cos
2
θ
\sin^2\theta+\cos^2\theta
sin
2
θ
+
cos
2
θ
c)
sin
θ
+
cos
θ
\sin\theta+\cos\theta
sin
θ
+
cos
θ
d)
sin
2
θ
−
cos
2
θ
\sin^2\theta-\cos^2\theta
sin
2
θ
−
cos
2
θ
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