(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=
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(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=(1+Cos45°-Sin30°)(1-Sin45°+Cos
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)
=(1+√2/2-1/2)(1-√2/2+1/2)
=(1/2+√2/2)(3/2-√2/2)
=3/4+√2/2-1/2
=1/4+√2/2
很抱歉!算错了。
(1+2倍根号2)/2
原式=(1+√2/2 -1/2)(1-√2/2+ 1/2)
=1^2-(√2/2 -1/2)^2
=1-(1/2 -√2/2+1/4)
=1/4+√2/2
原式=[1+(Sin45°-Sin30°)][1-(Sin45°-Sin30°)]=1-(Sin45°-Sin30°)^2=1-1/2-1/4+2分之根号2=1/4+2分之根号2
Cos45°=Sin45°
Sin30°=Cos60°
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)
=(1+Cos45°-Sin30°)(1-Cos45°+Sin30°)
=1^1-(Cos45°-Sin30°)^2
1-[(√2/2)-(1/2)]^2
=1-[(3/4)-(√2/2)]
=(1/4)-(√2/2)
=(1-2√2)/4
解答如下:
=[1+(根号下2)/2 -1/2]*[1+(根号下2]/2+1/2]
=[1+(根号下2)/2]^2-1/4
=5/4-(根号下2)
4分之1加2倍根号2
sin30°+cos45°
(cos45°sin30°)÷(cos45°+sin30°)
计算、tan平方60°+4sin30°cos45°、sin30°/(1+cos30°)+1/tan30°
sin30°+1/2(sin45°+cos45°)-sin^2 20°-cos^2 20°
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=
1/2*tan60°+根号2/2*cos45°- sin30°*cos30°
1/2cos30°+根号2/2cos45°-sin30°-sin45°
1/2sin30°+根2/2cos45°+sin60°*cos60°=?
计算sin30°-cos45°÷1+tan60°=(保留根号)
|cos45°-sin60°|+根号sin30°
sin45°×cos45°-sin30°
sin30°-tan30°+cos45°
【sin30°/(sin60°-cos45°)】—(根号下(1—tan60°)²)—tan45°
计算(1)1/2 sin60°+2/√2 cos45°+sin30°•cos30°
计算:sin30°+cos45°*sin45°-tan60°
cos30°cos45°+sin30°sin45°等于多少?
根2sin30°+tan60°-cos45°=
sin30°-二分之根号2cos45°+三分之一