sint (-sint)dt cost 1+cost t 4sin-cos 2 2 di cost 2 7 2co 2 -2sin2! -joc2aoh=- cost cost =t-In sect+tant+C 1 1,V1-x2 =arccos- .-ln-+ +C X 1 1+V1-x2 arccos -In +C x8 1 1 1 x dx x x − +  1 sin ( sin ) cos 1 cos t t dt t t = − +  2 2 2 4sin s 1 2 2 cos 2 s 2 t t co dt t t co − =  2 2sin 2 cos t dt t − =  cos 1 cos t dt t − =  1 cos dt dt t = −   = − + + t t t C ln | sec tan | 2 1 1 1 arccos ln x C x x x − = − + + 2 1 1 1 arccos ln | | x C x x + − = − +