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NDA 2017
Exam
NDA
Year
2017
Subject
Mathematics
Chapter
Differentiation

NDA 2017 · Mathematics · Differentiation

If l_1= d dx ( ^ x ) aligned & l_2= _ h arrow 0 ^ (x+h) - ^ x h &...

If l1=ddx(\mathrmesin⁡x)l_1=\frac{\mathrm{d}}{\mathrm{dx}}\left(\mathrme^{\sin \mathrm{x}}\right)l2=lim⁡h→0\mathrmesin⁡(x+h)−\mathrmesin⁡xhl3=∫\mathrmesin⁡xcos⁡xdx\begin{aligned} & l_2=\lim _{\mathrm{h} \rightarrow 0} \frac{\mathrme^{\sin (\mathrm{x}+\mathrm{h})}-\mathrme^{\sin \mathrm{x}}}{\mathrm{h}} \\ & l_3=\int \mathrme^{\sin \mathrm{x}} \cos \mathrm{xdx}\end{aligned}$$ then which one of the following is correct?

Options

  1. Al1≠l2l_1 \neq l_2
  2. Bddx(l3)=l2\frac{\mathrm{d}}{\mathrm{dx}}\left(l_3\right)=l_2
  3. C∫l3dx=l2\int l_3 \mathrm{dx}=l_2
  4. Dl2=l3l_2=l_3

Correct answer

B. ddx(l3)=l2\frac{\mathrm{d}}{\mathrm{dx}}\left(l_3\right)=l_2

Step-by-step solution

l1=ddx(\mathrmesin⁡x)l2=lim⁡h→0\mathrmesin⁡(x+h)−\mathrmesin⁡xh\begin{aligned} & l_1=\frac{\mathrm{d}}{\mathrm{dx}}\left(\mathrme^{\sin \mathrm{x}}\right) \\ & l_2=\lim _{\mathrm{h} \rightarrow 0} \frac{\mathrme^{\sin (\mathrm{x}+\mathrm{h})}-\mathrme^{\sin \mathrm{x}}}{\mathrm{h}}\end{aligned}l3=∫\mathrmesin⁡x⋅cos⁡xdxl2=lim⁡h→0\mathrmesin⁡(x+h)−\mathrmesin⁡xh=ddx(\mathrmesin⁡x)=l1\begin{aligned} & l_3=\int \mathrme^{\sin \mathrm{x}} \cdot \cos \mathrm{xdx} \\ & l_2=\lim _{\mathrm{h} \rightarrow 0} \frac{\mathrme^{\sin (\mathrm{x}+\mathrm{h})}-\mathrme^{\sin \mathrm{x}}}{\mathrm{h}}=\frac{\mathrm{d}}{\mathrm{dx}}\left(\mathrme^{\sin \mathrm{x}}\right)=l_1\end{aligned}l_3=\int \mathrme^{\sin \mathrm{x}} \cdot \cos \mathrm{xdx}LetLet\sin x=t\mathrm{x}=\mathrm{t} \Rightarrow \cos xdx=dt\mathrm{xdx}=\mathrm{dt}l_3=\int \mathrme^{\mathrm{t}} \cdot \mathrm{dt}=\mathrme^{\mathrm{t}}+\mathrm{c}=\mathrme^{\sin \mathrm{x}}+\mathrm{c}\frac{\mathrm{d}}{\mathrm{dx}}$\left(l_3\right)=\frac{\mathrm{d}}{\mathrm{dx}}\left(\mathrme^{\sin \mathrm{x}}+\mathrm{c}\right)=\frac{\mathrm{d}}{\mathrm{dx}}\left(\mathrme^{\sin \mathrm{x}}\right)=l_1=l_2
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