cos(-8π/3)求值
求值cos5π/8*cosπ8
求值:cos(25π /4)
8sin(π/32)cos(π/32)cos(π/16)cos(π/8),求值
求值:sin(-3分之19π)+cos(-6分之25π)=?
求值:sin14π3+cos(−25π4)
求值:⑴sin(-19π/3)*cos(19π/6)
若cos(π/4+x)=3/5,求值
求值:sin(-6分之55拍)+cos(-3分之8拍)等于
求值:sin(π/4+3x)cos(3/π-3x)+cos(π/6+3x)cos(π/4+3x)
高中三角函数化简求值化简:√2-sin^2+cos4 (根号下) cos(π/9)*cos(2π/9)*cos(3π/9
不用计算器求值 cos^派/8加cos^4 3派/8加cos^4 5派/8加
求值:sin(π/12)+cos(π/12)