1. (2011/june/paper01/q3)
Given that $y=\mathrm{e}^{2 x} \sin 3 x$
(a) find $\dfrac{\mathrm{d} y}{\mathrm{~d} x}$ ( 3 )
(b) show that $\dfrac{\mathrm{d}^{2} y}{\mathrm{~d} x^{2}}=2 \dfrac{\mathrm{d} y}{\mathrm{~d} x}-9 y+6 \mathrm{e}^{2 x} \cos 3 x$ ( 4 )
2. (2012/jan/paper01/q5)
Differentiate with respect to $x$
(a) $y=x^{2} \mathrm{e}^{x}$ ( 2 )
(b) $y=\left(x^{3}+2 x^{2}+3\right)^{5}$ ( 3 )
3. (2012/june/paper02/q2)
Given that $x=t^{3}+4$ and $y=1-t+5 t^{2}$
(a) find
(i) $\dfrac{\mathrm{d} x}{\mathrm{~d} t}$
(ii) $\dfrac{\mathrm{d} y}{\mathrm{~d} t}$ ( 2 )
(b) Find $\dfrac{\mathrm{d} y}{\mathrm{~d} x}$ in terms of $t$ ( 2 )
4. $(2012 /$ june $/$ paper02/q4)
Differentiate with respect to $x$
(a) $\dfrac{1}{x^{2}}$ ( 2 )
(b) $\dfrac{1}{(2 x+1)^{2}}$ ( 2 )
(c) $\dfrac{1}{1-\cos ^{2} x}$ ( 3 )
5. $(2013 / \mathrm{jan} /$ paper02/q4)
Differentiate with respect to $x$
(a) $3 x \sin 5 x$ ( 3 )
(b) $\dfrac{e^{2 x}}{4-3 x^{2}}$ ( 3 )
6. (2014/jan/paper01/q3)
Differentiate with respect to $x$
(a) $\mathrm{e}^{3 x}(5 x-7)^{2}$ ( 3 )
(b) $\dfrac{\cos 2 x}{x+9}$ ( 3 )
7. $(2015 /$ june $/$ paper01/q2)
Given that $y=4 x^{2} \mathrm{e}^{2 x}$
(a) find $\dfrac{\mathrm{d} y}{\mathrm{~d} x}$ ( 3 )
(b) hence show that $x \dfrac{\mathrm{d} y}{\mathrm{~d} x}=2 y(1+x)$ ( 2 )
8. $(2016 / \mathrm{jan} / \mathrm{paper} 01 / \mathrm{q} 1)$
$$\mathrm{f}(x)=3 x^{3}+2 \sin x-\dfrac{4}{x^{2}} \text { where } x \neq 0$$
(a) Find $\mathrm{f}^{\prime}(x)$ ( 3 )
(b) Find $\int \mathrm{f}(x) \mathrm{d} x$ ( 4 )
9. $(2016 / \mathrm{jan} / \mathrm{paper} 02 / \mathrm{q} 4)$
Given that $y=\mathrm{e}^{2 x} \sqrt{x+1}$
show that $\dfrac{\mathrm{d} y}{\mathrm{~d} x}=\dfrac{\mathrm{e}^{2 x}(4 x+5)}{2 \sqrt{x+1}}$ ( 6 )
10. (2016/june/paper02/q4)
Differentiate with respect to $x$
$$\mathrm{e}^{2 x} \cos 3 x$$ ( 3 )
11. ( $2018 / \mathrm{jan} / \mathrm{paper} 02 / \mathrm{q} 5)$
Given that $y=2 \mathrm{e}^{x}\left(3 x^{2}-6\right)$
show that $\dfrac{\mathrm{d}^{2} y}{\mathrm{~d} x^{2}}-2 \dfrac{\mathrm{d} y}{\mathrm{~d} x}+y=12 \mathrm{e}^{x}$ ( 7 )
12. $(2018 /$ june $/$ paper02 $/ \mathrm{q} 2$ )
Differentiate with respect to $x$
(a) $e^{3 x} \cos 2 x$ ( 3 )
(b) $\dfrac{2 \mathrm{e}^{t}}{\left(2 x^{2}-1\right)}$ ( 3 )
13. $(2019 /$ june $/$ paper02 $/ \mathrm{q} 6$ )
(a) Given that $y=(4 x-3) \mathrm{e}^{2 *}$
(i) find $\dfrac{\mathrm{d} y}{\mathrm{~d} x}$ ( 3 )
(ii) show that $(4 x-3) \dfrac{\mathrm{d} y}{\mathrm{~d} x}=(8 x-2) y$ ( 2 )
(b) Differentiate $\dfrac{\sin 5 x}{(x-3)^{2}}$ with respect to $x$ ( 3 )
Answer
1. (a) $\dfrac{d y}{d x}=2 e^{2 x} \sin 3 x+3 e^{2 x} \cos 3 x$ (b) Show
2. (a)$\dfrac{d y}{d x}=x^{2} e^{x}+2 x e^{x} \quad$ (b) $\dfrac{d y}{d x}=5\left(x^{3}+2 x^{2}+3\right)^{4}\left(3 x^{2}+4 x\right)$
3. (a)(i) $\dfrac{d x}{d t}=3 t^{2}$ (ii) $\dfrac{d y}{d t}=-1+10 t$ (b) $\dfrac{d y}{d x}=\dfrac{10 t-1}{3 t^{2}}$
4. (a) $\dfrac{2}{x^{3}}$ (b) $\dfrac{4}{(2 x+1)^{3}}$ (c) $\dfrac{-2 \cos x}{\sin ^{3} x}$
5. (a) $3 \sin 5 x+15 x \cos 5 x$ (b) $\dfrac{2 e^{2 x}\left(4-3 x^{2}\right)-e^{2 x}(-6 x)}{\left(4-3 x^{2}\right)^{2}}$
6. (a) $3 e^{3 x}(5 x-7)^{2}+10 e^{3 x}(5 x-7)$ (b) $\dfrac{-2 \sin (2 x)(x+9)-\cos 2 x}{(x+9)^{2}}$
7. (a) $\dfrac{d y}{d x}=8 x e^{2 x}+8 x^{2} e^{2 x}$(b) Show
8. $(a) f^{\prime}(x)=9 x^{2}+2 \cos x+8 x^{-3}$ (b) $\dfrac{3 x^{4}}{4}-2 \cos x-\dfrac{4 x^{-1}}{-1}+C$
9. show
10. $2 e^{2 x} \cos 3 x-3 e^{2 x} \sin 3 x$
11. Show
12. $\begin{aligned}
13. $(a)$ (i) $\dfrac{d y}{d x}=4 e^{2 x}+2(4 x-3) e^{2 x}$ (ii) Show (b) $\dfrac{d y}{d x}=-2(x-3)^{-3} \sin 5 x+5(x-3)^{-2} \cos 5 x$
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