2015年7月12日 · $$\sin 20^\circ \, \sin 40^\circ \, \sin 60^\circ \, \sin 80^\circ =\frac{3}{16}$$ All my attempts were to get them in $\sin (2A)$ form after eliminating $\sin 60^\circ$ in both sides. …

2018年4月17日 · I am trying to find an expression for $\sin(40)$ in the following way: Let $\theta$ = 40. 3$\theta$=120

If sin 40° + sin 20° = sin 𝜃, find the value of 𝜃 Use a standard trigonometry identity = . It gives sin(40°) + sin(20°) = = = = = cos(10°) = sin(80°).

2024年10月21日 · $\begingroup$ If this arose in a math competition, the fact that $30 + 45 = 75$ (an angle whose trig values are simple quadratic irrationals) might be relevant -- I'm thinking of …

Hi, there-- THE PROBLEM: Evaluate (sin 70+cos 40)/(cos 70+sin 40) A SOLUTION: (sin 70+cos 40)/(cos 70+sin ...

$$\sin 40^\circ=\cos x$$ trigonometry; Share. Cite. Follow edited Apr 11, 2013 at 17:32. Andrew Uzzell ...

2024年1月26日 · To solve $\\sin x= 2\\sin(x-30^\\circ) \\sin(40^{\\circ})$ I expanded RHS by using $\\sin(\\alpha-\\beta)=\\sin\\alpha\\cos\\beta-\\sin\\beta\\cos\\alpha$, $$\\sin x ...

2016年7月12日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …

you will find that the sin of (220) and (-140) degrees is the same and that both of them are equal to - sine of (40) degrees. the numbers from my calculator are: sin(220) = -.64278676097

Question 1053377: If sin 40°+ sin 20°= sin tetha, find the value of tetha. Pleas help me. I know that this is easy but I want to make sure.