可得到下列恒等式（identity）：tanθ＝sinθ/cosθ,cotθ＝cosθ/sinθsecθ＝1/cosθ,cscθ＝1/sinθ分别用cos 2θ与sin 2θ来除cos 2θ＋sin 2θ＝1,可得：sec 2θ–tan 2θ＝1 及 csc 2θ–cot 2θ＝1对于负角度,六个三角函数分别为：sin(–θ)＝ –sinθ csc(–θ)＝ –cs...
1 Apply pythagoreanidentity. sec2(x)sec2(x) Because the two sides have been shown to beequivalent, theequationis anidentity. tan2(x)+1=sec2(x)tan2(x)+1=sec2(x)is anidentity tan2(x)+1=sec2(x)tan2(x)+1=sec2(x) ...
2. 正切函数（tangent function）：正切函数是一个周期性的函数，表示一个角的正切值。在数学中，正切函数通常用 tan(x) 表示。3. 余割函数（cosecant function）：余割函数是正弦函数的倒数，表示一个角的余割值。在数学中，余割函数通常用 csc(x) 表示。4. 三角恒等式（trigonometric identity）：...
2−1cos2(x)2-1cos2(x) Rewrite2−1cos2(x)2-1cos2(x)as2−sec2(x)2-sec2(x). 2−sec2(x)2-sec2(x) Because the two sides have been shown to beequivalent, theequationis anidentity. 2−sec2(x)=1−tan2(x)2-sec2(x)=1-tan2(x)is anidentity ...
Answer to: Verify the identity shown below. \dfrac{\cos(u)+1}{\tan^{2}(u)}=\dfrac{\cos(u)}{\sec(u)-1} By signing up, you'll get thousands of...
Prove the identity. 1+tan2xsin2x+cos2x=sec2x Proving Trigonometric Identities: The trigonometric identities are equations involving the trigonometric functions that are true for every value of the occurring variables in these identities. Most of the trigonometric ...
数学中tan是正切的意思。角θ在任意直角三角形中，与θ相对应的对边与邻边的比值叫做角θ的正切值。若将θ放在直角坐标系中即tanθ=y/x。tanA=对边/邻边。在直角坐标系中相当于直线的斜率k。
C. 2tan ^2x+1=tan ^2x-sec ^2x D. 2tan ^2x-1=tan ^2x-sec ^2x 相关知识点: 试题来源: 解析 A 结果一 题目 Identify the correct identity: ( )A. B. C. D. 答案 B相关推荐 1Identify the correct identity: ( )A. B. C. D. 反馈...
sin theta = x + 1/x is possible for some real values of x. 02:58 Is (sec x + tan x + 1)(sec x - tan x - 1) - 2tan x = 0 an identity. 02:23 The maximum value of 5cos theta + 12 sin theta is 17. This statement ... 03:02 If x = rsin theta*cos phi, y = ...
1 Prove the identity$$ \frac { \cot x - \tan x } { \cot x + \tan x } = \cos 2 x . $$ 相关知识点: 试题来源: 解析 Express the LHS in terms of either cos x and sin x or in terms of tan xUse Pythagoras0btain the given answer ...