If y = cos-1(cos x) then dr at x--4 is |

If y=cos(2cos^(-1)x)," then "y''=

Draw the graph of following function y = cos ^ (- 1) (cos x) y = sin ^ (- 1) (sin x) y = cos (cos ^ (- 1) x) y = sin (sin ^ (- 1) x)

If cos(x-y)=1 then cos x+cos y=

If y =a cos x + (b + 2x) sin x then show that y" + y=4 cos x.

Prove that, cos 4 x - cos4 y = 8(cos x - cos y)(cos x + cos y)(cos x - sin x)(cos x + sin y)

If cos (x-y)+1=0, then the value of (cos x+ cos y) and (sin x+sin y) is-

If cos^(-1)x+cos^(-1)y=pi/2 then prove that cos^(-1)x=sin^(-1)y

If (cos ^ (4) x) / (cos ^ (2) y) + (sin ^ (4) x) / (sin ^ (2) y) = 1 then prove that (cos ^ (4) y) / (cos ^ (2) x) + (sin ^ (4) y) / (sin ^ (2) x) = 1

If cos x+cos y=1 and cos x cos y=(1)/(4) then the G.S are

cos4x-cos4y = 8 (cos x-cos y) (cos x + cos y) (cos x-sin y) (cos x + sin y)