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[单选题]
设函数y=lncosx,则dy/dx=()
A.sinx/cosx
B.-sinx/cosx
C.-cosx/sinx
D.1/cosx
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A.sinx/cosx
B.-sinx/cosx
C.-cosx/sinx
D.1/cosx
此题为判断题(对,错)。
A.y’(t)/x(t)
B.-y’(t)/x(t)
C.y’(t)/x’(t)
D.y(t)/x’(t)
E.-y(t)/x’(t)
A.f’(cos2x)sin2xd2x
B.2f’(cos2x)dx
C.2f’(cos2x)sin2xdx
D.-f’(cos2x)sin2xdLx
设y=y(x)是函数方程ln(x2+y2)=x+y-1在(0,1)处所确定的隐函数,求dy及
设函数f(x)及g(x)在区间[a,b]上连续,且f(x)≥g(x),那么[f(x)-g(x)]dx在几何上表示什么?