cos²45°-1/cos60°+1/tan45°+cos²30°+sin²45°
tan²30°+cos²30°-sin²45°tan45°
计算:sin²30°+cos²45°+根号2sin60°×tan45°
计算:(1)根号2sin45°+cos²60°-根号3tan60°+sin30°·tan45°
sin平方120°+cos180°+tan45°-cos平方(-330°)+sin(-210°)
计算 sin30°+cos²60°-tan45°-根号3*tan30°
计算:sin30°+cos60°+tan45°=______.
计算:sin260°+cos60°-tan45°=______.
化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)
√(cos 60°-1)²+2√cot 45°-sin 60°+|sin 30°-1|=?
/1-根号2/-(tan45°-1/2011)0次方+cos60°×(1/2)12次方+根号18求解答
(cos 45°-sin 30°)/(cos 45°+sin 30°)
tan30° sin30° cos30° tan60° sin60° cos60° tan45°