If tan X=x-1/4x ,then sec x-tan x is equal to
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tan x=x-x/4
tan²x=x²+(x/4)²-x²/2
sec²x-1=x²+(x/4)²-x²/2
sec x=√(1+x²+(x/4)²-x/2)
now add sec x & ( -tan x)
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