"sin"(5pi)/(12)=sin75^(@) =sin(45^(@)+30^(@)) =sin45^(@)cos30^(@)+cos45^(@)sin30^(@) =(1)/(sqrt(2))*(sqrt(3))/(2)+(1)/(sqrt(2))*(1)/(2)=(1)/(sqrt(2))((sqrt(3)+1)/(2)) =(sqrt(3)+1)/(2sqrt(2))xx(sqrt(2))/(sqrt(2))=(sqrt(6)+s
sin(π6)π6的准确值为1212。 12cos(π4)+cos(π6)sin(π4)12cos(π4)+cos(π6)sin(π4) cos(π4)π4的准确值为√2222。 12⋅√22+cos(π6)sin(π4)12⋅22+cos(π6)sin(π4) cos(π6)cos(π6)的准确值为√3232。 12⋅√22+√32sin(π4)12⋅22+32sin(π4) ...
单位换为度：5π/12=75º【2】由公式可得：sin75º=sin(45º+30º)=sin45ºcos30º+cos45º;sin30º=(√2/2)(√3/2)+(√2/2)(1/2)=(√6+√2)/4 ∴原式=（√6+√2)/4
2sin""pi/12sin""(5pi)/12-এর মান হবে― 02:41 যদি xsintheta=ysin (theta+(2pi)/3)=zsin (theta+(4pi)/3) হয়, তবে (xy+yz... 06:00 (cosA+cos3A+cos5A+cos7A)/(cosA*cos2A*cos4A)-এর মান হবে― 04:16 cos52^...
相关知识点: 试题来源: 解析 【解析】 $$ 原式=1-2 \sin ^{2}\frac{5 \pi}{12} \\ = \cos ^{2}\frac{5 \pi}{12}- \sin ^{2}\frac{5 \pi}{12} \\ = \cos \frac{5}{6}\pi \\ =- \frac{\sqrt{3}}{2} $$ 反馈 收藏 ...
解:(1)因为点P(5,-12),所以$$ r = 1 3 $$ 所以由正弦的定义得$$ \sin \alpha = - \frac { 1 2 } { 1 3 } . $$ (2)原式$$ = \frac { - \cos \alpha } { \sin \alpha } \cdot \frac { \tan \alpha } { - \cos \alpha } = \frac { \sin \alpha } { \si...
Step by step video, text & image solution for माना f(x)=2 sin^3 x-3 sin^2 x+12 sin x+5,0≤x≤ pi/2 हो,तो by Maths experts to help you in doubts & scoring excellent marks in Class 12 exams. Updated on:21/07/2023 ...
-tan(- 5pi/12) 怎样计的?不是直接求啊.是这一种答案:sin (13pi/12) = (- √3 +1)/(2√2) 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 原式=tan(pi -1/3 pi -1/4 pi )=... 解析看不懂?免费查看同类题视频解析查看解答...
Prove that: sin^(-1) (12/13)+cos^(-1) (4/5)+tan^(-1) (63/16)=pi 03:57 Evaluateint\x^5(2-x)\dx 01:25 Find the value of tan^(-1)(x/y)-tan^(-1)((x-y)/(x+y)) 03:04 Solve for x: tan^(-1)3x+tan^(-1)2x=pi/4 02:11 Evaluate int\(3-x).x^2\dx 01...
【解析】 [解析] ∵P(12,5),∴$$ | O P | = 1 3 $$. ∴$$ \sin \alpha = \frac { 5 } { 1 3 } , \cos \alpha = \frac { 1 2 } { 1 3 } , \tan \alpha = \frac { 5 } { 1 2 } $$. (1)$$ \sin ( 3 \pi + \alpha ) \cdot \tan ( \theta -...