题目: pm(x=0)2x/tanx=()A 0B 1C 2D 3 免费查看参考答案及解析 题目: limsinx2/tan2x(x2 3x) 免费查看参考答案及解析 题目: 2.lim x2/tanx(3x2)A.1/2 B.1/4 C.1 D.1/3 免费查看参考答案及解析 题目: 【考查知识点:无穷小量】已知f(x) - tan x -1,当( )时,f(x)为无穷...
\lim_{x \rightarrow 1} (1-x)\tan {\pi\over2}x=\lim_{x \rightarrow 1} (1-x)\cdot \dfrac{\sin \dfrac{\pi}{2} x}{\cos \dfrac{\pi}{2} x}=\lim_{x \rightarrow 1} \dfrac{[(-1)\cdot \sin \dfrac{\pi}{2} x+(1-x)\cdot \cos \dfrac{\pi}{2} x\cdot \dfrac{...
三角函数与不等式的已知不等式2x大于(x^2-1)*sina+1,对于任意的锐角a都成立.求x的取值范围. 免费查看参考答案及解析 题目: 数学三角函数Rt△ABC ∠C=90 tanA:tanB=1:4 求tanB 免费查看参考答案及解析 题目: 一道数学三角函数题△ABC中的角A、B、C的对边长分别为a,b,c若tanA*tanB/(tanA+tanB)=...
【解析】 $$解: /im(1-x)\tan \frac{ux}{2} \\ x \rightarrow 1 \\ = \lim _{x \rightarrow 1}\frac{1-x}{(ot \frac{\pi}{2}x}) ( \frac{0}{0} 溶&达法则) \\ = \lim _{x \rightarrow 1- \frac{\pi}{2}(Sc^{2 \pi}\frac{\pi}{2}} \\ = \frac{2...
Answer to: \lim_{x\rightarrow \frac{\pi}{2}}\frac{- \sec x}{1 + \tan x} By signing up, you'll get thousands of step-by-step solutions to your...
tan2 x tan2x=sec2x−1 limx→π(1+secx)(1−secx+sec2x)sec2x−1 Step 5: Simplify the expression Notice thatsec2x−1=tan2x. So we can simplify further: limx→π(1+secx)(1−secx+sec2x)tan2x Step 6: Cancel common factors ...
若\(1+ \sin 2x=2 \cos ^{2}\dfrac{x}{2}\),\(x \in (0, \pi )\),则\(\tan 2x\)的值构成的集合为( )A:
求下列函数的周期(1)y=tan2x,x≠pi/4+kpi/2(k∈Z)(2)y=5tan x/2,x≠(2k+1)pi(k∈Z)(急)
解 原式$$ = \lim _ { x \rightarrow 1 } \frac { 1 - x } { \cot \frac { \pi x } { 2 } } = \lim _ { x \rightarrow 1 } \frac { - 1 } { - \frac { \pi } { 2 } \cos c ^ { 2 } \frac { \pi x } { 2 } } = \frac { 2 } { \pi } ....
lim(x to (pi)/(2))tan^(-1){(sin(atan^(3)x+btan^(2)x+ctanx))/(atan^(3)x+btan^(2)x+ctanx)} का मान है