1)=9+х2-6х-х2-9+5х+22=-6х+5х+22 (9 и х2 сокращаем)=-1х+22
4)а)2*(9х2+6b+b2)
б)3аb+12a-2bc-8c
в)х*(х+2у)-4 (х+2у)=(х-4)*(х+2у)
А) = <u>sin(6a-2a)</u> = <u>sin4a </u> = tga
cos(3a+a) cos4a
Б)<u />
= <u>sin(128-68)</u> = <u>sin60</u> =tg60= корень из 3
cos(44+16) cos60
1) 2х²-6х+3х²-9х-28=0
5х²-6х-28=0
5х²-6х=28