求值sin120°+cos180°+tan45°-cos(-330°)+sin(-210°)
sin平方120°+cos180°+tan45°-cos平方(-330°)+sin(-210°)
(1)求值sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)
sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)=______.
Sin平方120度加Cos180度加Tan45度减Cos平方(-330度)加Sin(-210度)等于多少?要有点过程最好
Sin^2(120º)+cos180º+tan45º-cos^2(-330º)+
计算:sin²30°+cos²45°+根号2sin60°×tan45°
tan²30°+cos²30°-sin²45°tan45°
sin120°= cos120°=
化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)
求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
计算:(1)根号2sin45°+cos²60°-根号3tan60°+sin30°·tan45°
计算 sin30°+cos²60°-tan45°-根号3*tan30°