If `x[(2),(3)]+y[(-1),(1)]=[(10),(5)]` , then find the values of x and y.

If 3/5xy=15 ,then find the least value of 2(x+y) .

If x + y=5 , then find the greatest value of 10xy.

If 2x+ 3y = 5 , then find the greatest value of 8xy.

If 4x+y=5 ,then find the greatest value of 1/3(xy) .

If sin^(-1) x +sin^(-1)y +sin^(-1) z =(3pi)/(2) , then find the value of x^(100) +y^(100) +z^(100) -(9)/(x^(101)+y^(101)+z^(101)) .

If sin^(-1)x +sin^(-1)y =(2pi)/(3) , then find the value of cos^(-1)x +cos^(-1)y .

Let |(3,y),(x,1)|=|(3,2),(4,1)| , find the possible values of x,y,epsilonN .

If sec^(-1)x="cosec"^(-1)y(|x|ge1,|y|ge1) , then find the value of cos^(-1)(1/x)+cos^(-1)(1/y) .

If [(1,2,-1),(x,3,y),(-1,6,4)] is a symmetric matrix, then find x and y