The angle between the tangents from \( (a, b) \) to the circle \( x^{2}+y^{2}=a^{2} \) is
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\[
x^{2}+y^{2}+2 a x+2 b y+c=0
\]
and \( x^{2}+y^{2}+2 b x+2 a y+c=0 \)
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