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Limit of the function (-cot(a)+cot(x))/(x-a)

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     /-cot(a) + cot(x)\
 lim |----------------|
x->a+\     x - a      /
limxa+(cot(a)+cot(x)a+x)\lim_{x \to a^+}\left(\frac{- \cot{\left(a \right)} + \cot{\left(x \right)}}{- a + x}\right)
Limit((-cot(a) + cot(x))/(x - a), x, a)
Rapid solution [src]
 /       2   \ 
-\1 + tan (a)/ 
---------------
       2       
    tan (a)    
tan2(a)+1tan2(a)- \frac{\tan^{2}{\left(a \right)} + 1}{\tan^{2}{\left(a \right)}}