cosa-sina=3√2/51-sin2a=18/25sin2a=7/251+sin2a=32/25(cosa+sina)^2=32/25cosa+sina=-4√2/5sin2α+2sin^2α/(1-tanα)=2sinα(cosα+sinα)/[(cosα-sinα)/cosα]=sin2α(cosα+sinα)/(cosα-sinα)=[-7/25*4√...