Question

求积分 (tanx^2+tanx^4 )dx

Answer 1

S((tanx)^2+(tanx)^4 )dx

=S(tanx)^2(1+(tanx)^2)dx

=S(tanx)^2 *(secx)^2)dx

=S(tanx)^2 d(tanx)

=1/3*tan(x)^3+C