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{tex}{1-tan x\over 1+tan x} \\ = {tan {\pi\over 4} - tan x\over 1 +tan x.tan {\pi\over 4}}\\ = tan ({{\pi\over 4} - x} ){/tex}
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Sia ? 4 years, 6 months ago
Perpendicular is a line that makes 90 degrees angles.
Altitude is also a line that makes 90 degrees angle but it always starts with a vertex.
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