Commerce (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

If `"tan"^-1 2  "x + tan"^-1 3  "x" = pi/4`, then x is ____________.

`"tan" (pi/4 + 1/2 "cos"^-1 "x") + "tan" (pi/4 - 1/2 "cos"^-1 "x") =` ____________.

`"tan"^-1 1/3 + "tan"^-1 1/5 + "tan"^-1 1/7 + "tan"^-1 1/8 =` ____________.

`"cos"^-1["cos"(2"cot"^-1(sqrt2 - 1))]` = ____________.

`"cos" (2  "tan"^-1 1/7) - "sin" (4  "sin"^-1 1/3) =` ____________.

The value of `"cos"^-1 ("cos" ((33pi)/5))` is ____________.

`"sin"^-1 (1 - "x") - 2  "sin"^-1 "x" = pi/2`

If `6"sin"^-1 ("x"^2 - 6"x" + 8.5) = pi,` then x is equal to ____________.

`"cos"^-1 1/2 + 2  "sin"^-1 1/2` is equal to ____________.

`"tan"^-1 1 + "cos"^-1 ((-1)/2) + "sin"^-1 ((-1)/2)`

`"sin"^-1 (1/sqrt2)`

`"tan"^-1 (sqrt3)`

`"cos"^-1 (1/2)`

`"sin"^-1 ((-1)/2)`

If `"sin" {"sin"^-1 (1/2) + "cos"^-1 "x"} = 1`, then the value of x is ____________.

If `"sin"^-1 (1 - "x") - 2  "sin"^-1 ("x") = pi/2,` then x is equal to ____________.

If `3  "sin"^-1 ((2"x")/(1 + "x"^2)) - 4  "cos"^-1 ((1 - "x"^2)/(1 + "x"^2)) + 2 "tan"^-1 ((2"x")/(1 - "x"^2)) = pi/3` then x is equal to ____________.

Solve for x : `{"x cos" ("cot"^-1 "x") + "sin" ("cot"^-1 "x")}^2` = `51/50

If matrices A and B are inverse of each other then ____________.

If A `= [(5, "x"),("y", 0)]` and A = A' then ____________.