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Mathematics
Mathematics
Problem
8. If
3
cot
A
=
4
3 \cot \mathrm{~A}=4
3
cot
A
=
4
, check whether
1
−
tan
2
A
1
+
tan
2
A
=
cos
2
A
−
sin
2
A
\frac{1-\tan ^{2} \mathrm{~A}}{1+\tan ^{2} \mathrm{~A}}=\cos ^{2} \mathrm{~A}-\sin ^{2} \mathrm{~A}
1
+
t
a
n
2
A
1
−
t
a
n
2
A
=
cos
2
A
−
sin
2
A
or not.
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