close
標題:
F4 A-Maths...Trigo..
此文章來自奇摩知識+如有不便請留言告知
發問:
Solve the following equation 0
最佳解答:
sin(x - 40*) + sin(x + 80*) = 1 - 2 sin ( x + 20* ) sin 60* = 1 [sin ( x + 20* )]( - 2 )( sqr 3 / 2 ) = 1 sin ( x + 20* ) = - 1 / sqr 3 x + 20* = 215.264* or 324.736* x = 195* or 305* ( cor. to the nearest degree ) 2008-03-15 22:41:35 補充： Sorry sth wrong, plx just ignore the above: sin(x - 40*) + sin(x + 80*) = 1 2 sin ( x + 20* ) cos 60* = 1 sin ( x + 20* ) = 1 x + 20* = 90* x = 70*
其他解答:
sin(x - 40) + sin(x + 80) = 1 x = 70*63D0B758E2D502CC
文章標籤
全站熱搜
留言列表
