• 2022-06-03 问题

    3. 已知函数$y= \tan x$,则$y''(x) =$( )。 A: $ - \sec ^ 2 x \tan x$ B: $ \sec ^ 2 x \tan x$ C: $ - 2 \sec ^ 2 x \tan x$ D: $2 \sec ^2 x \tan x$

    3. 已知函数$y= \tan x$,则$y''(x) =$( )。 A: $ - \sec ^ 2 x \tan x$ B: $ \sec ^ 2 x \tan x$ C: $ - 2 \sec ^ 2 x \tan x$ D: $2 \sec ^2 x \tan x$

  • 2022-06-03 问题

    求函数[img=173x42]17da65390bf2806.png[/img]的导数; ( ) A: tan(pi/4 + x/2) B: (tan(pi/4 + x/2)^2/2 ) /tan(pi/4 ) C: (tan(pi/4 + x/2)^2/2 + 1/2) D: (tan(pi/4 + x/2)^2/2 + 1/2) /tan(pi/4 + x/2)

    求函数[img=173x42]17da65390bf2806.png[/img]的导数; ( ) A: tan(pi/4 + x/2) B: (tan(pi/4 + x/2)^2/2 ) /tan(pi/4 ) C: (tan(pi/4 + x/2)^2/2 + 1/2) D: (tan(pi/4 + x/2)^2/2 + 1/2) /tan(pi/4 + x/2)

  • 2022-06-10 问题

    \( {\sec ^2}x - {\tan ^2}x = \)______. ______

    \( {\sec ^2}x - {\tan ^2}x = \)______. ______

  • 2022-07-22 问题

    \( {\sec ^2}x - {\tan ^2}x = \)______. ______

    \( {\sec ^2}x - {\tan ^2}x = \)______. ______

  • 2022-06-14 问题

    \(\int { { {\sec }^{3}}xdx}\)=( ) A: \(\frac{1}{2}\sec x\cot x-\frac{1}{2}\ln \left| \sec x+\tan x \right|+C\) B: \(\frac{1}{2}\sec x\tan x+\frac{1}{2}\ln \left| \sec x+\tan x \right|+C\) C: \(-\frac{1}{2}\csc x\tan x+\frac{1}{2}\ln \left| \sec x-\cot x \right|+C\) D: \(-\frac{1}{2}\sec x\tan x-\frac{1}{2}\ln \left| \csc x+\tan x \right|+C\)

    \(\int { { {\sec }^{3}}xdx}\)=( ) A: \(\frac{1}{2}\sec x\cot x-\frac{1}{2}\ln \left| \sec x+\tan x \right|+C\) B: \(\frac{1}{2}\sec x\tan x+\frac{1}{2}\ln \left| \sec x+\tan x \right|+C\) C: \(-\frac{1}{2}\csc x\tan x+\frac{1}{2}\ln \left| \sec x-\cot x \right|+C\) D: \(-\frac{1}{2}\sec x\tan x-\frac{1}{2}\ln \left| \csc x+\tan x \right|+C\)

  • 2021-04-14 问题

    x属于(0,pi/2),tan(x)/x ×

    x属于(0,pi/2),tan(x)/x ×

  • 2022-07-01 问题

    x属于(0,pi/2),tan(x)/x<x/sin(x)。()

    x属于(0,pi/2),tan(x)/x<x/sin(x)。()

  • 2021-04-14 问题

    设 y=tan x, y ''=(): -2sec2x×tan x|-2secx×tan 2x.|2sec2x×tan x|2secx×tan 2x.

    设 y=tan x, y ''=(): -2sec2x×tan x|-2secx×tan 2x.|2sec2x×tan x|2secx×tan 2x.

  • 2022-06-16 问题

    lim(1-x)tan派x/2(x趋向1)

    lim(1-x)tan派x/2(x趋向1)

  • 2022-06-10 问题

    \( \int {\sec x(\sec x - \tan x)dx} = \)( ) A: \( \tan x - \sec x + C \) B: \( \tan x + \sec x + C \) C: \(- \tan x - \sec x + C \) D: \(- \tan x + \sec x + C \)

    \( \int {\sec x(\sec x - \tan x)dx} = \)( ) A: \( \tan x - \sec x + C \) B: \( \tan x + \sec x + C \) C: \(- \tan x - \sec x + C \) D: \(- \tan x + \sec x + C \)

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