Tangent is limiting case of secant

Tangent is limiting case of secant
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Geogebra applet on Tangent is limiting case of secant

https://files.metastudio.org/media/2/b/2/9a747eaa4e4eba0f1766e0c607e0be7e603c712860d6eee1f180a6b4d5d64.html

License: CC-BY-SA 4.0 unported
Source: NCERT