Question

1/(3+5cosx)求积分

Answer 1

=1/5*S（代表积分号）dx/(cosx+cos(arccos3/5))=S d(x+π/2)/（sin(x+π/2)-sin(arccos3/5+3π/2)）=1/sin(arccos3/5)*ln|cos((x-arccos3/5)/2)/cos(x+arccos3/5)|+C;