Commerce (English Medium) Class 12 - CBSE Question Bank Solutions

Prove that `int_0^"a" "f" ("x") "dx" = int_0^"a" "f" ("a" - "x") "d x",` hence evaluate `int_0^pi ("x" sin "x")/(1 + cos^2 "x") "dx"`

Write the coordinates of the point which is the reflection of the point (α, β,  γ) in the XZ-plane.

Evaluate: `int_0^pi ("x"sin "x")/(1+ 3cos^2 "x") d"x"`.

Find : `int_  (2"x"+1)/(("x"^2+1)("x"^2+4))d"x"`.

Evaluate `int_0^(pi/2) (tan^7x)/(cot^7x + tan^7x) "d"x`

Find `int_2^8 sqrt(10 - x)/(sqrt(x) + sqrt(10 - x)) "d"x`

Find `int_0^(pi/4) sqrt(1 + sin 2x) "d"x`

Show that `int_0^(pi/2) (sin^2x)/(sinx + cosx) = 1/sqrt(2) log (sqrt(2) + 1)`

Evaluate `int_(-1)^2 "f"(x)  "d"x`, where f(x) = |x + 1| + |x| + |x – 1|

`int_("a" + "c")^("b" + "c") "f"(x) "d"x` is equal to ______.

`int_(-1)^1 (x^3 + |x| + 1)/(x^2 + 2|x| + 1) "d"x` is equal to ______.

If `int_0^1 "e"^"t"/(1 + "t") "dt"` = a, then `int_0^1 "e"^"t"/(1 + "t")^2 "dt"` is equal to ______.

`int_(-2)^2 |x cos pix| "d"x` is equal to ______.

`int_(-"a")^"a" "f"(x) "d"x` = 0 if f is an ______ function.

`int_0^(2"a") "f"(x) "d"x = 2int_0^"a" "f"(x) "d"x`, if f(2a – x) = ______.

`int_0^(pi/2) (sin^"n" x"d"x)/(sin^"n" x + cos^"n" x)` = ______.

Evaluate the following:

`int_0^(pi/2)  "dx"/(("a"^2 cos^2x + "b"^2 sin^2 x)^2` (Hint: Divide Numerator and Denominator by cos⁴x)

Evaluate the following:

`int_(-pi/4)^(pi/4) log|sinx + cosx|"d"x`

`int_((-pi)/4)^(pi/4) "dx"/(1 + cos2x)` is equal to ______.

`int_0^(pi/2) sqrt(1 - sin2x)  "d"x` is equal to ______.