1) a tg(п/2-а)=ctga
2) a cos^2a+sin^2a=1
1-2=-1
3) в 2sinп/12соsп/12=sinп/6=1/2
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1) a tg(п/2-а)=ctga
2) a cos^2a+sin^2a=1
1-2=-1
3) в 2sinп/12соsп/12=sinп/6=1/2