求值:sin26π3+cos(−17π4)
求值:sin14π3+cos(−25π4)
若cos(π/4+x)=3/5,求值
求值:cos(25π /4)
求值:⑴sin(-19π/3)*cos(19π/6)
求值:3tan12°−3sin12°(4cos
化简求值sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)
求值tan(kπ+π/6)cos(kπ-4π/3),k属于z
求值:sin(π/12)+cos(π/12)
求值cos5π/8*cosπ8
求值:sin(π/4+3x)cos(3/π-3x)+cos(π/6+3x)cos(π/4+3x)
化简求值:sin(π/4-3x)*cos(π/3-3x)-cos(π/6+3x)*sin(π/4+3x)
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-