Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Problem
Problem
If
2
cos
A
=
cos
B
+
cos
3
B
\sqrt{2} \cos A = \cos B + \cos^3 B
2
cos
A
=
cos
B
+
cos
3
B
, and
2
sin
A
=
sin
B
−
sin
3
B
\sqrt{2} \sin A = \sin B - \sin^3 B
2
sin
A
=
sin
B
−
sin
3
B
then
sin
(
A
−
B
)
=
\sin(A - B) =
sin
(
A
−
B
)
=
a.
±
1
\pm 1
±
1
b.
±
1
2
\pm \frac{1}{2}
±
2
1
c.
±
1
3
\pm \frac{1}{3}
±
3
1
d.
±
1
4
\pm \frac{1}{4}
±
4
1
Browse the problem library