(1/2)|[1/(sin^2x)(1+(cos^2x))]]d(cos^2x)(1/2)|[1/(1-cos^2x)(1+(cos^2x)]d(cos^2x)(1/4)|[1/(1-cos^2x)-1/(1+cos^2x]d(cos^2x)-(1/4)|d[ln|1-cos^2x|]-(1/4)d[ln|1+cos^2x|]=-(1/8)(ln|1-cos^2x|)^2-(1/8)(ln|1+c...