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TN XII Math
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Objective type Questions and Answers
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Q)
If
a
=
cos
α
−
i
sin
α
,
b
=
cos
β
−
i
sin
β
,
c
=
cos
γ
−
i
sin
γ
then
(
a
2
c
2
−
b
2
)
/
a
b
c
is
(
1
)
cos
2
(
α
−
β
+
γ
)
+
i
sin
2
(
α
−
β
+
γ
)
(2)
−
2
cos
(
α
−
β
+
γ
)
(3)
−
2
i
sin
(
α
−
β
+
γ
)
(4)
2
cos
(
α
−
β
+
γ
)
Share
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