\[\frac{{{d}^{20}}y}{d{{x}^{20}}}(2\cos x\cos 3x)\]= [EAMCET 1994]

\[{{2}^{20}}(\sin 2x+{{2}^{20}}\sin 4x)\]

\[{{2}^{20}}(\cos 2x-{{2}^{20}}\cos 4x)\]

\[{{2}^{20}}(\cos 2x+{{2}^{20}}\cos 4x)\]

\[{{2}^{20}}(\sin 2x-{{2}^{20}}\sin 4x)\]

\[\frac{{{d}^{20}}y}{d{{x}^{20}}}(2\cos x\cos 3x)\]=

1.	\[\frac{{{d}^{20}}y}{d{{x}^{20}}}(2\cos x\cos 3x)\]= [EAMCET 1994]
A.	\[{{2}^{20}}(\cos 2x-{{2}^{20}}\cos 4x)\]
B.	\[{{2}^{20}}(\cos 2x+{{2}^{20}}\cos 4x)\]
C.	\[{{2}^{20}}(\sin 2x+{{2}^{20}}\sin 4x)\]
D.	\[{{2}^{20}}(\sin 2x-{{2}^{20}}\sin 4x)\]
Answer» C. \[{{2}^{20}}(\sin 2x+{{2}^{20}}\sin 4x)\]

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\[\frac{{{d}^{20}}y}{d{{x}^{20}}}(2\cos x\cos 3x)\]= [EAMCET 1994]

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