1-sint/cost - cost/1+sint выражение

ответ:
1-sint/cost-cost/1+sint
1-tgx-(cost/cos^2x+sin^2x)+sinx
1-tgx-(cost+sinx(cos^2x+sin^2x)/cos^2x+sin^2x)
1-tgx-(cost+cos^2x+sin^3x)/cos^2x+sin^2x)