sin^2 30°+2sin60°+tan45°-tan60°-cos^2 30°是不是等于1/2?
计算:sin²30°+cos²45°+根号2sin60°×tan45°
(1)sin60°-tan45°; (2)cos60°+tan60°; (3)根号2 /2 sin45°+sin60°-
sin60 sin30 cos60 cos30 sin45 cos45 tan30 tan60 tan45°各等于多少
计算:(1)根号2sin45°+cos²60°-根号3tan60°+sin30°·tan45°
tan30° sin30° cos30° tan60° sin60° cos60° tan45°
【sin30°/(sin60°-cos45°)】—(根号下(1—tan60°)²)—tan45°
根号【cos45°-cos30°】*2-tan60°分之tan45°+sin45°
cos60°+tan60° 2/根号2sin45°+sin60°-2cos45°
我们知道:sin30°=1/2,tan30°根号下3/3,sin45°=根号下2/2,tan45°=1,sin60°=根
(sin30°)/(sin60°−cos45°) - tan60° 等于多少?
sin60°/cos30°-tan45° “/”是分之的意思
tan²30°+cos²30°-sin²45°tan45°