28=cos((x)/(1+sqrt(x)))

cos^-1((x)/sqrt(1+x^2))

lim_(x rarr(-1)^(+))(sqrt(pi)-sqrt(cos^(-1)x))/(sqrt(x+1)) is equal to

"cos" 2x =(sqrt(2) + 1) ("cos"x- (1)/(sqrt(2))),"cos" x ne (1)/(2) rArr x in

cos 2x=(sqrt(2)+1)(cos x - (1)/(sqrt(2))), cos x ne (1)/(2) rArr x in

"cos" 2x =(sqrt(2) + 1) ("cos"x- (1)/(sqrt(2))),"cos" x ne (1)/(2) rArr x in

If y=cos^(-1)((sqrt(x)-1)/(sqrt(x)+1))+cosec^(-1)((sqrt(x)+1)/(sqrt(x)-1)) , then (dy)/(dx) is equal to

Lt_(x to-1) ((sqrt(pi))-sqrt(cos^(-1)x))/(sqrt(x+1))=

Simplest form of tan^(-1)((sqrt(1+cos x)+sqrt(1-cos x))/(sqrt(1+cos x)-sqrt(1-cos x))), pi lt x lt (3 pi)/(2) is: