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Home  >>  EAMCET  >>  Mathematics
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If $f(x) =10 \cos x +(13+2x) \sin x$ then $f''(x)+f(x)$ is equal to :

\[\begin {array} {1 1} (a)\;\cos x & \quad (b)\;4 \cos x \\ (c)\;\sin x & \quad (d)\;4 \sin x \end {array}\]

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1 Answer

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$(b)\;4 \cos x$
answered Feb 27, 2014 by meena.p
 
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