化简:sin780°cos1110°+cos(-660°)sin(-690°)+tan585°cos1440°
化简:sin780°cos1110°+cos(-660°)sin(-690°)+tan585°cos1440°
计算不太明白...求值sin(-1320°)*cos1110°+cos(-1020°)sin750°+tan(-405°
高一数学sin(-1770)*cos1500+cos(-690)*sin780+tan405
化简:根号1+2sin(40°)cos(40°)
(cos 45°-sin 30°)/(cos 45°+sin 30°)
Cos(180°+α)*sin(α+360°)/sin(-α-180°)*cos(-180°-α)
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简
化简cos^2(-α)-[tan(360°+α)/sin(-α)]
化简,cos²(-α)-tan(360°+α)/sin(-α)
化简cos(540°-α)sin(α-360°)/sin(-α+180°)cos(180°+α)
化简:cos(90°-a)/sin(270°+a)·sin(180°-a)·cos(360°-a)=
化简:cos平方(θ+15°)+sin平方(θ-15°)+sin(θ+180°)cos(θ-180°)