How to differentiate this $$e^{\tfrac{1}{\sin x}}$$
Help me how to differentiate that please help me Thanks.

Hint: Use the chain rule. You may also have to know that: $$\dfrac{\mathrm d}{\mathrm dx}e^x=e^x\quad\color{grey}{\text{and}}\quad\dfrac{\mathrm d}{\mathrm dx}\dfrac1{\sin x}=-\cot x\csc x.$$
And in case you forgot: $$\csc x\equiv \dfrac1{\sin x}\quad\color{grey}{\text{and}}\quad\cot x\equiv \dfrac1{\tan x}.$$
I hope this helps. 
Best wishes, $\mathcal H$akim.
