Упростите выражение а)

А) (sint+cost) ^2/ (1+2sin t cos t)=(sin^2t+2sint cost+cos^2t) / (1+2sint cost)=(1+2sint cost) / (1+2sint cost)=1b) (1-2sin t cos t) / (cos t-si t) ^2=(1-2sint cost) / (cos^2t-2sint cost+sin^2t)=(1-2sint cost) / (1-2sint cost)=1a) cos^2 t/1-sin t -sint t=1 (1-sin^2t) -sint (1-sint) / (1-sint)=1 (1-sin^2t-sint+sin^2t) / (1-sint)=1 (1-sint) / (1-sint)=1