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