• 2022-07-26
    假设L为映象面上点与圆锥顶点A间的距离,a为地球半径,φ为纬度,θ为余纬,θx为标准纬度的余纬,m为放大倍数。以下关系错误的是
    A: m=kL/asinθ
    B: L=a/ksinθx(tan(θ/2)/tan(θx/2))
    C: m=sinθ/sinθx(tan(θ/2)/tan(θx/2))
  • C

    内容

    • 0

      已知\( y = \tan x \),则\( dy \)为( ). A: \( \tan xdx \) B: \( \cos xdx \) C: \( {\sec ^2}xdx \) D: \( \sin xdx \)

    • 1

      \(\mathop {\lim }\limits_{x \to 0} 2 { { \tan x - \sin x} \over { { {\sin }^3}x}}{\rm{ = }}\)______。______

    • 2

      $\int {{{x\cos x} \over {{{\sin }^3}x}}} dx = \left( {} \right)$ 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$

    • 3

      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)

    • 4

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