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If sec A=54, verify that 3 sin A-4 sin3 A4 cos3 A-...
1.
If sec A=54, verify that 3 sin A-4 sin3 A4 cos3 A-3 cos A=3 tan A-tan3 A1-3 tan2 A.
Answer» If
sec
A
=
5
4
, verify that
3
sin
A
-
4
sin
3
A
4
cos
3
A
-
3
cos
A
=
3
tan
A
-
tan
3
A
1
-
3
tan
2
A
.
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