已知2sin2α+sin2β=3sinα,则sin2α+sin2β的值域是[0,54]∪{2}[0,54]∪{2}.
举一反三
- 已知tan阿尔法=3,sin^2阿尔+sin2阿尔法+2cos^2阿尔法=?
- 已知sinα+2cosα=0,则sin2α+cos2α=______.
- [x^2*sin(1/x^2)]/x的X趋于0的极限,为什么不能用sin(1/x^2)~1/x^2带入.
- 设f(x)是可导函数,且f′(x)=sin<sup>2</sup>[sin(x+1)],f(0)=4,f(x)的反函数是x=φ(y),则φ′(4)=()。 A: 1/sin<sup>2</sup>(sin1) B: sin<sup>2</sup>(sin1) C: -sin<sup>2</sup>(sin1) D: -1/sin<sup>2</sup>(sin1)
- 函数[img=79x27]180355ae2690a03.png[/img]在x=2处的二阶泰勒展开式为 A: exp(sin(2))+cos(2)*exp(sin(2))*(x-2)+exp(sin(2))*(sin(2)/2-cos(2)^2/2)*(x-2)^2 B: exp(sin(2))+cos(2)*exp(sin(2))*(x-2)-exp(sin(2))*(sin(2)/2-cos(2)^2/2)*(x-2)^2 C: exp(sin(2))+cos(2)*exp(sin(2))*(x-2)-exp(sin(2))*(sin(2)/2+cos(2)^2/2)*(x-2)^2 D: exp(sin(2))+cos(2)*exp(sin(2))*(x-2)+exp(sin(2))*(sin(2)/2+cos(2)^2/2)*(x-2)^2