sin theta = cos (90- theta)అనుట సబాబేనా? ఎందుకు?
原式=1+cos(2θ+30°)2+1−cos(2θ−30°)2+cosθsinθ =1+12(cos2θcos30°-sin2θsin30°-cos2θcos30°-sin2θsin30°)+12sin2θ =1-sin2θsin30°+12sin2θ =1. 本题是一道关于三角函数化简求值的题目,解答本题的关键是熟记二倍角公式以及两角和(差)的余弦公式; 利用余弦...
सिद्ध कीजिए : sec theta "cosec " (90^(@)-theta) - tan theta cot (... 02:01 सिद्ध कीजिए : (sin theta . sec (90^(@) - theta) cot (90^(@) - thet... 03:00 सिद्ध कीजिए : (1 + sin (90...
已知\theta是锐角 \DeltaABC的一个内角,满足如下四个公式: ①\sin(90^{\circ}-\theta)=\cos\theta②\cos(90^{\
Answer to: If 0 degrees < theta < 90 degrees, is sin theta equal to cos (90 degrees theta), and for what reason? By signing up, you'll get...
Answer to: Show how to write sin(theta) in terms of cos(theta). By signing up, you'll get thousands of step-by-step solutions to your homework...
Answer to: Verify the following identity: (cos\theta - sin \theta)^2 = 1 - sin(2 \theta). By signing up, you'll get thousands of step-by-step...
PROE解释这个关系式r=d1/2 theta=t*90 x=r*cos(theta)+r*sin(theta)*theta*(pi/180) y=r*sin(theta)-r*cos(theta)*theta*(pi/180) z+0 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 这个是螺旋线吧。。d1螺旋线的直径,theta角度(确定终圈落在那个象限的意思),xyz表...
解析 【解析】 $$ \sin ^ { 2 } \theta + \sin ^ { 2 } ( 9 0 ^ { \circ } - \theta ) \\ = \sin ^ { 2 } \theta + \cos ^ { 2 } \theta = 1 $$ 故选B. 结果一 题目 【题目】 sin^2θ+sin^2(90^o-θ)(0^o+θ90°) 等于( A.0 B.1 C.2 D. ...
化简:(1)$$ \frac { 1 + \sin 2 \theta - \cos 2 \theta } { 1 + \sin 2 \theta + \cos 2 \t