化简Sin(90度-2X)
化简sin(2π+x)cos(π-x)sin(π-x)/cos(x-π)sin(-π-x)sin(π+x)
设X属于(0,90度),求y=[2sin^2(X)+1]/[sin(2X)]的最小值
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1
化简 cos^2(x)*sin^2(x)-sin^2(x)
化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x)
化简【完整步骤!】1.(sin^4x-sin^2x)/secx2.sin^4x-cos^4x【这道题的正确答案是sin^
化简:1+sin(x-360度)cos(x-270度)-2cos平方x
化简(1)√3sin x+cos x (2)√2(sin x-cos x) (3)√2cos x-√6sin x
化简(sin^2 x/sin x-cosx)-(sin x+cosx/tan^2 x-1)
已知cos(x-45度)=十分之根号二,X属于(90度,135度).求sin x的值、sin(2x+60度)的值
化简sin(2x+π/3)-(根号3)sin²x+sinxcosx+(根号3)/2
化简sin(x+60°)+2sin(x-60°)-3