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If (cos theta= dfrac 1 2 left(a+ dfrac 1 a right) ) then (cos3 theta ) in terms of ('a' )=
1.
If
c
o
s
θ
=
1
2
(
a
+
1
a
)
cos \theta=\dfrac{1}{2}\left(a+\dfrac{1}{a}\right)
cos
θ
=
2
1
(
a
+
a
1
)
then
c
o
s
3
θ
cos3\theta
cos
3
θ
in terms of
′
a
′
'a'
′
a
′
=
হানি নাটস
ক
1
4
(
a
3
+
1
a
3
)
\dfrac{1}{4}\left(a^3+\dfrac{1}{a^3}\right)
4
1
(
a
3
+
a
3
1
)
খ
4
(
a
3
+
1
a
3
)
4\left(a^3+\dfrac{1}{a^3}\right)
4
(
a
3
+
a
3
1
)
গ
1
2
(
a
3
+
1
a
3
)
\dfrac{1}{2}\left(a^3+\dfrac{1}{a^3}\right)
2
1
(
a
3
+
a
3
1
)
ঘ
None of these
মক টেস্ট দিন: মান নির্ণয়
If (cos theta= dfrac 1 2 left(a+ dfrac 1 a right) ) then (cos3 theta ) in terms of ('a' )= | Suva Ai
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