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Mathematics
Mathematics
Problem
Which one of the following expressions is equal to
1
1
1
for every real value of
x
x
x
? a)
(
sin
x
+
cos
x
)
2
(\sin x+\cos x)^2
(
sin
x
+
cos
x
)
2
b)
tan
2
x
+
1
\tan^{2}x+1
tan
2
x
+
1
c)
sin
2
x
+
cos
2
x
\sin^{2}x+\cos^{2}x
sin
2
x
+
cos
2
x
d)
sin
x
+
cos
x
\sin x+\cos x
sin
x
+
cos
x
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