(2008•宝山区一模)方程cos(x+π6)cos(x+π3)−sin(x+π6)sin(x+π3)=1
已知f(x)=-1/2+sin(π/6-2x)+cos(2x-π/3)+cos平方x.
(2012•上饶一模)f(x)=sinπ3x−3cosπ3x
已知函数f(x)=sin(x+π6)−cos(x+π3)+cosx,
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1
(2013•南开区一模)已知函数f(x)=sin(2x+π6)−cos(2x+π3)+2cos2x.
(2005•闸北区一模)已知函数f(x)=sin(x+π6)−cos(x+π3)+cosx,
求证 tan(2π-X)sin(-2π-X)cos(6π-X)/ sin(X+3π/2)*cos(X+3π/2)=-ta
(2013•南京一模)设向量a=(sin(x−π3),cos(x−π3)),b=(cos(φ+5π6),sin(φ+5π
已知函数f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)=sin(2x-π/6) ,
sin(x-π/3)=1/3,则cos(x+π/6)=?
化简(1)√3sin x+cos x (2)√2(sin x-cos x) (3)√2cos x-√6sin x
已知函数f(x)=cos(2x-π/3)+sin^2 x-cos^2 x