If `y=cos^(-1)((1)/(2sin x))` then `(d^(2)y)/(dx^(2))` at `((pi)/(4),(pi)/(4))` is

If (sin x)(cos y)=(1)/(2), then (d^(2)y)/(dx^(2)) at ((pi)/(4),(pi)/(4)) is (a)-4(b)-2(c)-6(d)0 at ((pi)/(4),(pi)/(4))

If 2 sin x. cos y=1, then (d ^(2)y)/(dx ^(2)) at ((pi)/(4), (pi)/(4)) is …….

If 3y+sin(xy)=4" then "((dy)/(dx))" at "((pi)/(2),1)

If ( sin x) (cos y) = 1//2, then d^(2)y//dx^(2) at (pi//4, pi//4) is

If y=sin^(-1)(sin x), then (dy)/(dx) at x=(pi)/(2) is

If y=cos x+sin x, then at x=(pi)/(2),(d^(2)y)/(dx^(2)) is

If y=cos^(-1)(cos x) then (dy)/(dx) at x=(5 pi)/(4) is (i) 1( ii) -1( iii) (1)/(sqrt(2))( iv) sqrt(2) at x=(5 pi)/(4) is (i)

x=a cos t,y=a sin t then (d^(2)(y))/(dx^(2)) at t=(pi)/(3),(pi)/(6),(pi)/(2),(pi)/(4)

If y=sec(tan^(-1)x), then (dy)/(dx)atx=1 is (a) (cos pi)/(4)(b)(sin pi)/(2)(c)(sin pi)/(6)(d)(cos pi)/(3)