Question
Differentiate the following function with respect to $(\text{x})$:$\frac{\cos(\text{x}-2)}{\sin\text{x}}$
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$
\lim _{x \rightarrow \frac{x}{4}}\left[\frac{\cos x-\sin x}{\cos 2 x}\right]
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If $x(1+3 i)+y(2-i)-5+i^3=0$, find $x+y$