填空题,①cosπ/5×cos2π/5=_______②函数y=1/1+sinΧ的定义域是_____③sin(α+30°)-sin(α-30°)/cosα=_____只给1,2两题的答案也得啊…
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![填空题,①cosπ/5×cos2π/5=_______②函数y=1/1+sinΧ的定义域是_____③sin(α+30°)-sin(α-30°)/cosα=_____只给1,2两题的答案也得啊…](/uploads/image/z/14319964-28-4.jpg?t=%E5%A1%AB%E7%A9%BA%E9%A2%98%2C%E2%91%A0cos%CF%80%2F5%C3%97cos2%CF%80%2F5%3D_______%E2%91%A1%E5%87%BD%E6%95%B0y%3D1%2F1%2Bsin%CE%A7%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E6%98%AF_____%E2%91%A2sin%28%CE%B1%2B30%C2%B0%29%EF%BC%8Dsin%28%CE%B1-30%C2%B0%29%2Fcos%CE%B1%3D_____%E5%8F%AA%E7%BB%991%EF%BC%8C2%E4%B8%A4%E9%A2%98%E7%9A%84%E7%AD%94%E6%A1%88%E4%B9%9F%E5%BE%97%E5%95%8A%E2%80%A6)
填空题,①cosπ/5×cos2π/5=_______②函数y=1/1+sinΧ的定义域是_____③sin(α+30°)-sin(α-30°)/cosα=_____只给1,2两题的答案也得啊…
填空题,
①cosπ/5×cos2π/5=_______
②函数y=1/1+sinΧ的定义域是_____
③sin(α+30°)-sin(α-30°)/cosα=_____
只给1,2两题的答案也得啊…
填空题,①cosπ/5×cos2π/5=_______②函数y=1/1+sinΧ的定义域是_____③sin(α+30°)-sin(α-30°)/cosα=_____只给1,2两题的答案也得啊…
第一题你写的我看不懂,抱歉无法给你回答;
2.定义域是X不等于(二分之三排加上2k排).
3.
1.0.25
2 x≠2/3+2kπ
3 √3/(2cosa)
cosπ/5×cos2π/5=
cosπ/5cos2π/5=?
求COSπ/5*COS2π/5
COSπ/5乘以COS2π/5
cosπ/5×cos2π/5
cosπ/5cos2π/5
若cos(π-θ)=3/5,cos2θ=
cos(π-θ)=3/5 求cos2θ
cos(π- θcos2θ)=3/5 求
cosπ/5 - cos2π/5 怎样变成 cosπ/5 + cos2π/5rt
(cosπ/5)(cos2π/5)的值等于
cosπ/5·cos2π/5等于多少?
cosπ/5*cos2π/5的值等于
cosπ/5 乘以cos2π/5等于多少
化简cosπ/5cos2π/5RT.
cosπ/5*cos2π/5 =(2sinπ/5*cosπ/5*cos2π/5)/(2sinπ/5) =(sin2π/5*cos2π/5)/(2sinπ/5) =(2sin2π/低2部咋算的?
cosπ/5 +cos2π/5 +cos3π/5 +cos4π/5 =可以简写.
设sin(π/4+α)+cos(π/4+α)=-1/5,则cos2α=