Los 9020
Verify Cas 3A = 4 cos3 "A-3 COSA, when A= 30
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Answer:
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
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