23.8. Докажите тождество: 1) cos? (180°- x) + cos? (270° + х) = 1;
2) cos? (720° - x) + sin? (540° + х) = 1;

Question

Алгебра: 23.8. Докажите тождество: 1) cos? (180°- x) + cos? (270° + х) = 1;2) cos? (720° - x) + sin? (540° + х) = 1;​

АннаФилип270406 · Answer

1) sin 152° =sin(180-28)=sin282)cos124°=cos(90+34)=-sin343)sin242°=sin(270-28)=-cos284)cos196°=cos(180+16)=-cos165)sin175°=sin(180-5)=sin56)cos 235°=cos(270-35)=-cos357)tg 111°=tg(90+21)=-ctg218) ctg 215°=ctg(180+35)=ctg359)sin 312°=sin(270+42)=-cos4210) cos 166°=cos(180-14)=-cos1411)sin 290°=sin(270+20)=-cos2012)ctg 163°=ctg(180-17)=-ctg1713) tg 286°=tg(270+16)=-ctg1614)cos 326°=cos(360-34)=cos3415)sin 221°=sin(180+41)=-sin4116) cos 306°=cos(270+36)=sin3617) tg 187°=tg(180+7)=tg718) ctg 319°=ctg(360-41)=-ctg41...

23.8. Докажите тождество: 1) cos? (180°- x) + cos? (270° + х) = 1;2) cos? (720° - x) + sin? (540° + х) = 1;​

23.8. Докажите тождество: 1) cos? (180°- x) + cos? (270° + х) = 1;
2) cos? (720° - x) + sin? (540° + х) = 1;