Jambmaths question: If $y=3\cos 4x,\text{ }\frac{dy}{dx}$ equals Jamb Maths Solution: $\frac{dy}{dx}=\frac{d}{dx}(3\cos 4x)=3\times (-4\sin 4x)=-12\sin 4x$ Jamb Maths Topic: DifferentiationYear of Exam: Jamb Maths 2009
