Evaluate lim x → π/4 (tan³x - tanx)/cos(x + π/4)

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Evaluate lim x → π/4 (tan^3x - tanx)/cos(x + π/4)

lim x tends to pi/4 tan^3x-tanx/cos(x+pi/4)
Evaluate: lim(x→π/4) (tan^3 x - tan x)/(cos x + π/4)
lim x→π/4 tan^3x - tanx/ cos(x-π/4).
#math #calculus
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From which boook it is?
Btw thx for soln

SARTHAKMHATRE-tbvf