sin^230°+2sin^260°+tan45°-tan60°+cos^230°=
sin平方120°+cos180°+tan45°-cos平方(-330°)+sin(-210°)
计算:sin²30°+cos²45°+根号2sin60°×tan45°
计算:(1)根号2sin45°+cos²60°-根号3tan60°+sin30°·tan45°
tan²30°+cos²30°-sin²45°tan45°
sin平方45°+tan60°×cos30°等于多少?
根号【cos45°-cos30°】*2-tan60°分之tan45°+sin45°
化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)
tan30° sin30° cos30° tan60° sin60° cos60° tan45°
求两个数学题X/tan30°-X/tan60°=50和tan45°X-tan30°X=10
sin60 sin30 cos60 cos30 sin45 cos45 tan30 tan60 tan45°各等于多少
sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)=______.
【sin30°/(sin60°-cos45°)】—(根号下(1—tan60°)²)—tan45°