∫sec∧2x/(4+tan∧2x)dx

∫sec^4x dx ∫sec^2x tan^2x dx ∫cosx cos3x dx ∫tan^3t sect dt ∫(sec^2x)/4+tan^2 dx ∫ sec^2 x dx ∫(tan^(5)(x)*sec^(4)(x))dx 求积分∫（sec^2x/2+tan^2x）dx 求不定积分（1）dx/√x(1+√x)（2）dx/e^x+（e^-x）+2 (3)(tan^5x*sec^4x)dx ∫tan^2xdx=∫(sec^2x-1)dx ∫secx/sec^2x-1 dx ∫（sec^2x+sinx)dx tan（x)sec^2(x)dx,secx的导是secxtanx就是sec(x)d(sec(x)) 但tanx的导是se ∫ ( tan^2 x + tan^4 x )dx 求不定积分∫(tan^2x+tan^4x)dx