A.7cos(7x+3) B.7sinx C.7cosx D.7sin(7x+3)
A.初等函數(shù)的導(dǎo)函數(shù)是初等函數(shù) B.連續(xù)函數(shù)一定存在原函數(shù) C.初等函數(shù)的原函數(shù)是初等函數(shù) D.非初等函數(shù)沒(méi)有原函數(shù)
A.冪函數(shù) B.它自己 C.對(duì)數(shù)函數(shù) D.三角函數(shù)