If `y=cos^-1(cos4)` then find the value of y

If sec^(-1) x = cosec^(-1) y , then find the value of cos^(-1).(1)/(x) + cos^(-1).(1)/(y)

If sec^(-1) x = cosec^(-1) y , then find the value of cos^(-1) . 1/x + cos ^(-1) . 1/y .

If sec^(-1) x = cosec^(-1) y , then find the value of cos^(-1).(1)/(x) + cos^(-1).(1)/(y)

If sec^(-1) x = cosec^(-1) y , then find the value of cos^(-1).(1)/(x) + cos^(-1).(1)/(y)

If sec^(-1)x=cos e c^(-1)y , then find the value of cos^(-1)(1/x)+cos^(-1)(1/y)

If x , y ,z in [-1,1] such that cos^(-1)x+cos^1y+cos^(-1)z=3pi, then find the values of (1). x y+y z+z y and (2). x(y+z)+y(z+x)+z(x+y)

If x , y ,z in [-1,1] such that cos^(-1)x+cos^1y+cos^(-1)z=3pi, then find the values of (1) x y+y z+z y and (2) x(y+z)+y(z+x)+z(x+y)

If x , y ,z in [-1,1] such that cos^(-1)x+cos^1y+cos^(-1)z=3pi, then find the values of (1) x y+y z+z x and (2) x(y+z)+y(z+x)+z(x+y)

If sec^(-1)x=cos e c^(-1)y , then find the value of cos^(-1)1/x+cos^(-1)1/ydot

If sec^(-1)x=cos e c^(-1)y , then find the value of cos^(-1)1/x+cos^(-1)1/ydot