sin a=1/2,3cosa -4cos³a =
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Sin a=1/2
Cos a = underroot(1-sin^a)
Cos a=root 3/2
3cos a- 4 cos^3a=
=0 ans.
Cos a = underroot(1-sin^a)
Cos a=root 3/2
3cos a- 4 cos^3a=
=0 ans.
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