If `A= [[2,1], [1,1]]` and `A^-1 = [[1,-1] , [x,2]]` then find `x`

If A=[[0 ,1 ,3],[ 1, 2,x],[2, 3, 1]] and A^(-1)=[[1//2,-4 ,5//2],[-1//2, 3,-3//2],[ 1//2,y,1//2]] ,find x ,\ y .

If [1,1,x][[1,0,2],[0,2,1],[2,1,0]][[1],[1],[1]]=O find x

A={:[(1,2,1),(3,-1,2),(1,0,3)]:},B={:[(1,1,1),(-1,1,1),(2,-2,2)]:} then find matrix X such that 2A+X=2B.

y = cos ^(-1)((2x)/(1 +x^(2))),-1 lt x lt1 . find dy/dx

If f(x)=|((1+x)^a,(1+2x)^b,1),(1,(1+x)^a,(1+2x)^b), ((1+2x)^b,1,(1+x)^a)| then find constant term and coefficient of x

If x = (1)/(x- 5) , find: x^(2)- (1)/(x^(2))

If x = (1)/(x- 5) , find: x^(2) + (1)/(x^(2))

If 2(x^(2) + 1)= 5x , find x- (1)/(x)

tan^-1 (x-1)/(x-2) + tan^-1 (x+1)/(x+2)=pi/4. find X

If x in [-1, 0] , then find the value of cos^(-1) (2x^(2) - 1) - 2 sin^(-1) x