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<span>sin(45-альфа) / cos(45-альфа)=1
sin45cosA-cos45sinA/cosAcos45+sin45sinA=cosA-sinA/cosA+sinA не равно 1
cos(45+фльфа)=cos45cosA-sin45cosA при таком знаменателе =1</span>
((14+11)(14^2-14*11+11^2))/25-14*11=(25(14^2-14*11+11^2-14*11+14*11)/25-14*11=(14-11)^2+14*11-14*11=3^2=9