(1+tg²x )sin(п/2-2x)=1
sin(п/2-2x)=cos2xcos2x=(1-tg²x)/(1+tg²x)
(1+tg²x )*(1-tg²x)/(1+tg²x)=1
1-tg²x=1
tg²x=0
tgx=0
x=πn
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(1+tg²x )sin(п/2-2x)=1
sin(п/2-2x)=cos2x
cos2x=(1-tg²x)/(1+tg²x)
(1+tg²x )*(1-tg²x)/(1+tg²x)=1
1-tg²x=1
tg²x=0
tgx=0
x=πn