化简sin(—1071°)乘以sin99°+sin(—171°)乘以sin(—261°)
sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
化简(1)sin(-1071度).sin99度+sin(-171度).sin(-261度)
化简cos(180°+a)乘以sin(a+360°)/sin(-a-180°)乘以cos(-180°-a)
sin²60°+cos²60°-根号2cos45°跪求,sin²乘以x怎么算
尽快 我今天将就要!化简(计算)1、Sin²10°+Sin²20°+Sin²30°+Sin
cos(α-π)除以sin(π减α)乘以sin(α-2π)乘以cos(2π-α)化简
化简sin(x+60°)+2sin(x-60°)-3
化简sin(x+120°)+sin(x+240°)
化简:4sin(60°-A)*sinA*sin(60°+A).
化简sinA+sin(A+120°)+sin(A+240°)=?
求值4(cos40°-cos³40°)分之sin²80°乘以(1+√3tan10°)
计算:sin²1°+sin²2°+sin²3°...+sin²45°+sin