��.189 �� 10-11 �� (��)

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$�� 189. �� :�) {sin(x)cos(y)=0,25, sin(y)cos(x)=0,75};�) {x-y=-1/3, cos^2(?x)-cos^2(?y)=0};�) {4sin(x)sin(y)=3, tg(x)tg(y)=3};�)...$

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189. �� :

�) {sin(x)cos(y)=0,25, sin(y)cos(x)=0,75};

�) {x-y=-1/3, cos^2(?x)-cos^2(?y)=0};

�) {4sin(x)sin(y)=3, tg(x)tg(y)=3};

�) {sin^2(x)=cos(x)cos(y), cos^2(x)=sin(x)sin(y)}.

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