iodinefade9 iodinefade9

14-10-2017
Mathematics

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Question B please, working out as well please

Question B please working out as well please class=

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ejelonubenedict ejelonubenedict

14-10-2017

let y=4cos x
using product rule...
dy/dx = Udv + Vdu
where u = 4
v= cos X
dy/dx = 4×-sinX + cosX×0
dy/dx = -4sinX

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