If\[\mathbf{cos}\,\mathbf{3}x\mathbf{=4}\,\mathbf{co}{{\mathbf{s}}^{\mathbf{3}}}\mathbf{30{}^\circ }-\mathbf{3co}{{\mathbf{s}}^{\mathbf{3}}}\mathbf{0{}^\circ }\]then the value of x is ________

If\[\mathbf{cos}\,\mathbf{3}x\mathbf{=4}\,\mathbf{co}{{\mathbf{s}}^{\m

1.	If\[\mathbf{cos}\,\mathbf{3}x\mathbf{=4}\,\mathbf{co}{{\mathbf{s}}^{\mathbf{3}}}\mathbf{30{}^\circ }-\mathbf{3co}{{\mathbf{s}}^{\mathbf{3}}}\mathbf{0{}^\circ }\]then the value of x is ________
A.	0
B.	\[30{}^\circ \]
C.	\[20{}^\circ \]
D.	\[15{}^\circ \]
E.	None of these
Answer» C. \[20{}^\circ \]

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If\[\mathbf{cos}\,\mathbf{3}x\mathbf{=4}\,\mathbf{co}{{\mathbf{s}}^{\mathbf{3}}}\mathbf{30{}^\circ }-\mathbf{3co}{{\mathbf{s}}^{\mathbf{3}}}\mathbf{0{}^\circ }\]then the value of x is ________

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