If x=a cos theta-b sin theta and y=a sin theta+b cos theta then prove that :x^(2)+y^(2)=a^(2)+b^(2) View Solution If (x)/(a)cos theta+(y)/(b)sin theta=1 and (x)/(a)sin theta-(y)/(b)cos theta=-1, prove that (x^(2))/(a^(2))+(y^(2))/(b^(2))=...
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\theta d ( a \cos \theta ) + a \cos \theta d ( b \sin \theta ) \right] \\ = \frac { 1 } { 2 } a b \int _ { 0 } ^ { 2 i } ( \sin ^ { 2 } \theta + \cos ^ { 2 } \theta ) d \theta = \frac { 1 } { 2 } a b \cdot 2 \pi = \p...
a*cos(theta)-b*sin(theta)=c; a*sin(theta)+b*cos(theta)=d; 求theta ;其中a,b,c,d 已知 且满足a^2+b^2=c^2+d^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 联立方程cos(theta)=(b*d+c*a)/sqrt((b^2+a^2)(c^2+d^2)),很显然theta是向量(a,b)与...
这个公式的意思是,我们可以把 asinθ+bcosθa\sin\theta + b\cos\thetaasinθ+bcosθ 看作是一个新的正弦函数,它的振幅是 a2+b2\sqrt{a^2 + b^2}a2+b2,相位是 θ+φ\theta + \varphiθ+φ。 除了辅助角公式,三角函数还有一些其他的基本公式,比如: 同角三角函数关系: sin2θ+cos...
2)sint-2sqrt(2)cost=4-4sin(t+π/4)=3,故:sin(t+π/4)=1/4,故:cos(t-π/4)=1/4 因:5π/4<t<13π/4故:π<t-π/4<3π,即:π/2<t/2-π/8<3π/2,故:cos(t/2-π/8)<0 而:2cos(t/2-π/8)^2-1=1/4,故:cos(t/2-π/8)=-sqrt(10)/4 ...
笛卡尔的心形公式中,r=a(1-sin (theta))中的a是一个常数。在百度百科上,没有详细说明a的具体意义,但可以看到a的值越大,心形线的大小也随之增大,实际上a控制着心形线的大小。进一步来看,2a等于凹陷点与突出点间线段的长度。当theta等于0时,r=a,这似乎是心形线弧长的起点,或者说是心形线...
是的。是严谨的。可以证明。建议题主先了解一下极坐标,或者先思考一下这个问题的含义。
Answer to: Calculate cos (theta) and sin (theta) for the following angles. Leave your answers in exact form. a) theta = 150 degrees. b) theta = 225...
यदि a cos theta + b sin theta =m तथा a sin theta -b cos theta =n, तो सिद्ध करो कि a^(2)+b^(2)=m^(2)+n^(2)