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瀏覽:1181
日期:2025-12-15
2008年9月7日 ... cos15°=cos(45°-30°)=cos45°cos30°+sin45°sin30°=(根号6-根号2)/4. 评论(0) 0 0
... cos30=2(cos15)^2 -1 (cos15)^2=(cos30+1)/2=(√3+2)/4 ......
瀏覽:1404
日期:2025-12-18
2012年12月5日 - 4 分鐘 - 上傳者:ithenoob
Find the exact value of sin 15 and cos 15 without a calculator. Special triangles used....
瀏覽:1404
日期:2025-12-19
How to find the exact value of cos 15° using the value of sin 30°? Solution: For all
values of the angle A we know that, (sin A/2 + cos A/2)^2 = sin^2 A/2 + cos^2 ......
瀏覽:1014
日期:2025-12-19
24 Jun 2010 ... cos 75 + cos 15 = 2cos[(75+15)/2] cos [(75-15)/2]. cos 75 + cos 15 =
2cos45cos30. cos 75 + cos 15 = 2*[(sqrt2)/2]*[(sqrt3)/2]. cos 75 + cos 15 ......
瀏覽:378
日期:2025-12-20
If you factorize sin2Q you get, sin2Q = sin(Q + Q) = sinQcos Q + cosQsinQ = 2
sinQcosQ. So, you can write, sin30 = 2 sin15*cos15 sin30/2 = sin15* ......
瀏覽:589
日期:2025-12-13
sin(15) = sin(45-30) sin45*cos30 - cos45*sin30 =>(1/√2)*(√3/2) - (1/√2)*(1/2) =
>√3/2√2 - 1/2√2 =>(√3 - 1) /2√2 sec(15) = 1/cos15 = 2√2 /(√3 ......
瀏覽:1167
日期:2025-12-20
http://www.cut-the-knot.org/pythagoras/cos15.shtml, Accessed 03 February 2015.
We were unable ... The law of cosines gives cos(15), after a little more algebra....

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