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e so as marcadas a caneta
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1)sen(6π/7)=0,43388≈26 graus; cos(6π/7)=0,90096≈26 graus; tg(6π/7)=0,48157≈26 graus
2)P=(2-1)+(x+5)=3x+4;A=(2-1)(x+5)=2x²+10x-x-5=2x²+9x-5
3)a=2+4i; b=-4+4i; c=-15+20i
4)5-2i/3+4i=5-2i+3+4i/3+4i*3+4i=7+14i/9+16i²=7+14i/25=7/25+14i/25
2)P=(2-1)+(x+5)=3x+4;A=(2-1)(x+5)=2x²+10x-x-5=2x²+9x-5
3)a=2+4i; b=-4+4i; c=-15+20i
4)5-2i/3+4i=5-2i+3+4i/3+4i*3+4i=7+14i/9+16i²=7+14i/25=7/25+14i/25
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