tg(π/4+х)=1+tgx/1-tgx
tg(π/4+х)=(tgπ/4+tgx)/(1-tgπ/4tgx)=1+tgx/1-tgx
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tg(π/4+х)=1+tgx/1-tgx
tg(π/4+х)=(tgπ/4+tgx)/(1-tgπ/4tgx)=1+tgx/1-tgx