1.若tana=3,则 sin2a/ cos^2 a 的值等于?2.若a属于(0,π/2)且sin^2 a+cos2a=
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1.若tana=3,则 sin2a/ cos^2 a 的值等于?2.若a属于(0,π/2)且sin^2 a+cos2a=1/4 则tana=?
1.若tana=3,则 sin2a/ cos^2 a 的值等于?
2.若a属于(0,π/2)且sin^2 a+cos2a=1/4 则tana=?
3.已知函数F(x)=3sin^2 πx/2 +1 ,则使得f(x+c)恒成立的最小正整数C的值为?
1.若tana=3,则 sin2a/ cos^2 a 的值等于?
2.若a属于(0,π/2)且sin^2 a+cos2a=1/4 则tana=?
3.已知函数F(x)=3sin^2 πx/2 +1 ,则使得f(x+c)恒成立的最小正整数C的值为?
![1.若tana=3,则 sin2a/ cos^2 a 的值等于?2.若a属于(0,π/2)且sin^2 a+cos2a=](/uploads/image/z/18405115-43-5.jpg?t=1.%E8%8B%A5tana%3D3%2C%E5%88%99+sin2a%2F+cos%5E2+a+%E7%9A%84%E5%80%BC%E7%AD%89%E4%BA%8E%3F2.%E8%8B%A5a%E5%B1%9E%E4%BA%8E%EF%BC%880%2C%CF%80%2F2%EF%BC%89%E4%B8%94sin%5E2+a%2Bcos2a%3D)
sin2a/ cos^2 a =2sinacos a / cos^2 a =2tana=2*3=6
sin^2 a+cos2a=sin^2 a+cos^2a-sin^2 a =1/4
cos^2a =1/4
cosa =1/2
tana=√3
F(x)=3sin^2 πx/2 +1=3/2[1-cosπx]+1 最小正周期为2
C的值为2
再问: f(x)=(1+根号2cos(2x-π/4)) / sin(x+π/2) 求定义域会吗?谢谢
再答: 2cos(2x-π/4)≥0 2kπ-π/2≤2x-π/4≤2kπ+π/2 kπ-π/2≤x≤kπ+3π/2 sin(x+π/2)≠0 x+π/2 ≠kπ x≠kπ - π/2 交集即可kπ-π/2<x<kπ+π/2
sin^2 a+cos2a=sin^2 a+cos^2a-sin^2 a =1/4
cos^2a =1/4
cosa =1/2
tana=√3
F(x)=3sin^2 πx/2 +1=3/2[1-cosπx]+1 最小正周期为2
C的值为2
再问: f(x)=(1+根号2cos(2x-π/4)) / sin(x+π/2) 求定义域会吗?谢谢
再答: 2cos(2x-π/4)≥0 2kπ-π/2≤2x-π/4≤2kπ+π/2 kπ-π/2≤x≤kπ+3π/2 sin(x+π/2)≠0 x+π/2 ≠kπ x≠kπ - π/2 交集即可kπ-π/2<x<kπ+π/2
已知tana=2,则sin平方a+sin2a/cos平方a+cos2a
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