$\int {{1 \over {3 + 5\cos x}}} dx = \left( {} \right)$ A: ${1 \over 4}\ln \left| {{{2\cos x + \sin x} \over {2\cos x - \sin x}}} \right| + C$ B: ${1 \over 4}\ln \left| {{{2\cos {x \over 2} + \sin {x \over 2}} \over {2\cos {x \over 2} - \sin {x \over 2}}}} \right| + C$ C: $\ln \left| {{{\cos {x \over 2} + \sin {x \over 2}} \over {\cos {x \over 2} - \sin {x \over 2}}}} \right| + C$ D: $\ln \left| {{{\cos x + \sin x} \over {\cos x - \sin x}}} \right| + C$

$\int {{{x\cos x} \over {{{\sin }^3}x}}} dx = \left( {} \right)$ A: $ - {x \over {2{{\sin }^2}x}} - {1 \over 2}\tan x + C$ B: $ - {x \over {2{{\sin }^2}x}} - {1 \over 2}\cot x + C$ C: $ - {x \over {2{{\cos }^2}x}} - {1 \over 2}\cot x + C$ D: $ - {x \over {2{{\cos }^2}x}} - {1 \over 2}\tan x + C$

若\( \int {f(x)dx = {x^2} + C} \)，则\( \int {xf(1 - {x^2})dx = } \)( ) A: \( 2{(1 - {x^2})^2} + C \) B: \( - {1 \over 2}{(1 - {x^2})^2} + C \) C: \( {1 \over 2}{(1 - {x^2})^2} + C \) D: \( - 2{(1 - {x^2})^2} + C \)

下列广义积分发散的是（ ）。 A: \( \int_0^{ + \infty } { { e^{ - x}}dx} \) B: \( \int_0^1 { { x \over {\sqrt {1 - {x^2}} }}dx} \) C: \( \int_0^2 { { 1 \over { { {\left( {1 - x} \right)}^2}}}dx} \) D: \( \int_0^1 { { 1 \over {\sqrt {1 - x} }}dx} \)

设方阵\(A\)满足\({A^2} - A - 2E = O\),则\({A^{ - 1}} = \) A: \({1 \over 3}(A - E)\) B: \({1 \over 2}(A+ E)\) C: \({1 \over 2}(A - E) \) D: \((A - E) \)