(BPSC 1979)
(ii) If y -cosºx, find yn.
(iii) Find the nth derivative of cosx.cos2x.cos3x.
(iv) Find Yn if y=e* sinx.sin2x.
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Step-by-step explanation:
(iii)derivative cosx = -sinx
cos2x= 2
cos 3x= 3
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