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. If sin = 1/2, then show that 3cos - 4cos3 = 0. |
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Answer» Answer: GIVEN sinθ= 2 1
⟹θ= 6 π
LHS =3cosθ−4cos θ=3cos 6 π
−4cos 3
6 π
= 2 3 3
−4( 2 3
) 3 = 2 3 3
−4× 8 3 3
= 2 3 3
− 2 3 3
= |
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