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ज्ञात कीजिए कि बिन्दु \( (-1,-3) \) से कृत \( x^{2}+y^{2}+4 x+2 y-1=0 \) पर कितनी स्पर्श रेखाएँ खींची जा सकरी हैं?

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Put x = -1 & y = -3 in expression x2 + y2 + 4x + 2y - 1

then 

x2 + y2 + 4x + 2y - 1 = (-1)2 + (-3)2 - 4 - 6 - 1

= 1 + 9 - 11

= -1 < 0

Hence point (-1, -3) lies inside the circle.

Therefore, no tangent can be drawn from point (-1, -3) on the given circle.

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