Use the following figure to find out the exact value of cos(\dfrac{\beta}2). Find the exact value of the trigonometric function of the angle . Tan = ___ Use the figure to find the exact values of sin 2u, cos 2u, and tan 2u. Find the ...
所以1+2(\sin\beta )^2=4(\ sin\alpha )^2 2\cos2\alpha =2[1-2(\sin\alpha)^2]=2-4(\sin\alpha)^2=2-[1+2(\sin\beta )^2]=1-2(\sin\beta )^2=\cos2\beta 本题主要利用三角函数的性质进行求证。
https://socratic.org/questions/x-cosalpha-isinalpha-y-cosbeta-isinbeta-z-cosgama-isingama-and-x-y-z-xyz-prove-t This proposition is false, e.g. when α=0 , β=2π , γ=−2π Explanation: Let: ⎩⎪⎨⎪⎧α=0β=2π...
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设角alpha,be..这题不是那么容易的顶起,虽然这题在我们数学考试的时候是个废题(得多少都给分)还是作业党居多...我们考试题
(2)已知{\alpha},{\beta}{\in}(0,{\pi}),{\tan}({\alpha}-{\beta})=\frac{1}{2},{\tan}{\beta}=-\frac{1}{7},则2{\alpha}-{\beta}=___ 相关知识点: 试题来源: 解析 -(23)/(25);-(3π )/4 **(1)** 利用诱导公式将 sin(2α+π/3) 化为 cos(π/6-2α)...
例2 已知角{\alpha}的终边过点P(\frac{1}{2},{\cos}^{2}{\theta}),角{\beta}的终边过点Q({\sin}^{2}{\theta},-1),若{\tan}{\alpha}+\frac{1}{{\tan}{\alpha}}=1,( )求{\cos}2{\theta};( )求{\sin}({\alpha}+{\beta})...
已知\( \sin(\alpha) = \frac{1}{2} \),\( \cos(\beta) = -\frac{\sqrt{3}}{2} \),且\( \alpha, \beta \)均为第二象限角,则\( \cos(\alpha - \beta) \)的值为( ) A. \( \frac{1}{4} \) B. \( -\frac{1}{4} \) C. \( \frac{7}{8} \) D. \(...
由\frac{\pi }{2}<{}\beta <{}\pi ,\cos \beta =-\frac{2\sqrt{5}}{5}得\sin \beta =\sqrt{1-{{\cos }^{2}}\beta }=\frac{\sqrt{5}}{5},又0<{}\alpha <{}\frac{\pi }{2},∴\frac{\pi }{2}<{}\alpha +\beta <{}\frac{3\pi }{2},∵\sin \left( \...
Click here:point_up_2:to get an answer to your question :writing_hand:let a and b denote the statementsa cos alpha cos beta cos gamma