" 25."lim_(x rarr pi/4)(sec^(2)x-2)/(tan x-1)

lim_(x rarr pi/4) (sec^(2)x-2)/(tan x -1) is

Evaluate : lim_(x rarr pi/4)(sec^2 x-2)/(tanx-1) .

Lim_(x rarr pi)(1+sec^(3)x)/(tan^(2)x)

lim_(x rarr pi/2)(sec x - tan x)=

lim_ (x rarr (pi) / (2)) (sec x-tan x)

lim_(x rarr0)(sec x-1)/(x^(2))

Lim_(x to pi) (1+sec^(3)x)/(tan^(2)x)

lim_ (x rarr (pi) / (2)) (tan x) / (tan5x)

If alpha = lim_(x rarr pi//4)""(tan^(3)x - tan x)/(cos (x + (pi)/(4))) and beta = lim_(x rarr 0)(cos x)^(cot x) are the roots of the equation, a x^(2) + bx -4 = 0 , then the ordered pair (a, b) is :