hey dear u asked a similar sum just few minz b4 ...............try 2 do few of sinilar type on ur own

(itz ohk for evryone 2 answer u bt phir bhi .khud ppar try karna chhiye )

ur int basically is (sin^3x)/cosx

write it as(1-cos^2x)sinx/cosx

put cosx=t

-sinxdx=dt

thus ur int bcums

(t^2-1)dt/t

hope u knw 2 int this ! (daya)