380根号2sin(wt 30°)等于多少
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2kπ+π/4或者是2kπ+3π/4
√(sin²70°)-√(1-2sin20°×cos20°)+|sin20°-1|=|sin70°|-√(sin²20°+cos²20°-2sin20°×cos20°)+
sina+cosa=√2(√2/2sina+√2/2cosa)=√2(sinacosπ/4+cosasinπ/4)=√2sin(a+π/4)-1
2sin(-1110°)-sin960°+根号2cos(-225°)-cos(-210°)=2sin(-30-3*360)-sin(360*3-120)+根号2cos(135)-cos150=2*(-
原式=[2sin50°+2sin10°*sin(10°+30°)/cos10°]*√2sin80°=[2cos40°+2sin10°sin40°/cos10°]*√2cos10°=2√2(cos40°
根号下sin方70°-根号下1-2sin20°cos20°+|sin20°-1|=0.94-0.68+0.66=0.92
根号(1-2sin10cos10)/cos10-根号(1-sin^2100)=根号[(cos10-sin10)^2]/[cos10-根号(cos100)^2]=(cos10-sin10)/[cos10
sin²30°+cos²45°+根号2sin60°×tan45°=(1/2)²+(√2/2)²+√2×√3/2×1=1/4+1/2+√6/2=3/4+√6/2(
根号下(1-2sin10°cos10°)/[cos10°-根号下(1-sin^280°)]=根号下(sin10°-cos10°)^2/[cos10°-根号下(cos^280°)]=|sin10°-co
[2sin50+sin10(1+根号3*tan10)]根号(sin^2(80))=[2sin50+sin10(1+根号3*sin10/cos10)]sin80=[2sin50+sin10(1+根号3*
按照你的答案,你的题目输入有误,是化简:根号1-2sin(40°)cos(40°),原因是算术平方根是非负的.1-2sin(40°)cos(40°)=sin²40°+cos²40°
∵√3/2-√3sin²x+sinxcosx=(√3/2)(1-2sin²x)+(1/2)sin2x=sin(π/3)cos2x+cos(π/3)sin2x=sin(2x+π/3)
1+根号3tan10°=(cos10°+根号3sin10°)/cos10°=2(1/2×cos10°+1/2×根号3sin10°)/cos10°=2(cos60°cos10°+sin60°sin10°
为你提供精确解答(1)根号2cosα-根号2sinα=2sin(α-pi/4)(2)sinα+cosα=根号2sin(α+pi/4)学习宝典团队为你解答再问:有过程么?我想知道怎么做的,谢谢再答:好吧
分子=根号下(Cos10º-Sin10º)²分母=Sin10º-Cos10º所以比值为-1
(1)因为三角形ABC的周长为√2+1,所以a+b+c=√2+1,因为sinA+sinB=√2sinC,所以a+b=√2c,所以√2+1-c=√2c,所以c=1;(2)因为三角形面积=1/2absin
根号下1-2sin40°*cos40°/cos40°-根号下1-sin^250°=根号下sin²40°+cos²40°-2sin40°*cos40°/cos40°-根号下sin
sin²60°=(根号3/2)^2=3/4cos²60°=(1/2)^2=1/4根号2cos45°=根号2*根号2/2=1sin²60°+cos²60°-根号2