sin^2(20°)+cos^2(80°)+√3cos20°cos80°的计算过程
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/19 00:34:34
xRN@~i6]==yA"/`?4FEԈ&*1t>%K盙vRVTm]ռ:=~skIwIM=ҷP뵢4\Fvt{ETx%LQtW݀)MBfC̨f
Q|a? Z욞McS͵i:.dasy(3mcTT&AI$(y\#Sٕ +%ReP:+W^k`
qA\/dkSs\тl90/ZLX 9`ހ4lKלj p#
3-cos 20°/2-sin ^2 80°等于
(cos^2 10°-cos^2 80°)+sin^2 20°
sin^2 30°+cos()=1
sin^2 80°为什么等于 cos^2 10°?
求值:3/(sin^2 20°)-1/(cos^2 20°)+64sin^2 20°
利用和差角公式化简 (2)sin(π/3+α)+sin(π/3-α)(2)sin(π/3+α)+sin(π/3-α)(3)cos(π/4+α)-cos(π/4-α)(4)cos(60°+α)+cos(60°-α)(5)sin(α-β)cosβ+cos(α-β)sinβ(6)cos(α+β)cosβ+sin(α+β)sinβ
化简 (1+sin a+ cos a)(sin a/2 - cos a/2) / √(2+2cos a)(180°
化简:(1)(cos²10°-cos²80°)²+cos²70°=? (2)(sinα-cosα)²+sin4α/2cos2α=
2sin@+cos@等于?
sin^2(20)-sin^2(25)sin(20)+cos^2(50)+cos^2(25)sin20
sin(10°)+sin(20°)cos(50°)求值
(cos^2)15°+(sin^2)15°等于多少
Sin^2 45°+cos^2 45°=?
计算cos^2*105°-sin^2*105°
cos^2 22.5 °- sin^2 22.5°
cos^2 15°-sin^2 15°的值
cos^2 15°-sin^2 15°=
求(sin^2)15°(cos^2)15°