9.
E
U-
441
25
?
1
(1) 18
(2) 81
(3) 196
(4) 225
Answers
Answered by
18
Answer:
If A =30
∘
cos3A=Acos
3
A−3cosA
cos90
∘
=4(cos30
∘
)
2
−3(cosA30
∘
)
0=4.(
2
3
)=
2
3.
3
0=4.
2×2×2
3
3
−
2
3
3
0=
2
3
3
−
2
3
3
0 =0
LHS = RHS
Hence proved
deepakshanmugam390:
correct answer
Answered by
1
Answer:
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