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Mathematics
Mathematics
Problem
Evaluate
sin
x
+
sin
3
x
cos
x
+
cos
3
x
\dfrac{\sin x + \sin 3x}{\cos x + \cos 3x}
cos
x
+
cos
3
x
sin
x
+
sin
3
x
. a)
tan
x
\tan x
tan
x
b)
tan
2
x
\tan 2x
tan
2
x
c)
cot
2
x
\cot 2x
cot
2
x
d)
tan
3
x
\tan 3x
tan
3
x
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