БУДЕТ ПОЛУЧАТЬ 500 РУБЛЕЙ,ТК 25\% ОТ400=100 РУБЛЕЙ
Sin(pi/2 - a) =cosa
cos (pi/2 +a) = -sina
tg (3pi/2 - a) = ctga
ctg (pi-a) = -ctga
sin(pi-a) = sina
cos (pi+a)= -cosa
1) <u> 2 </u> + <u> 1 </u>= <u> 2 </u> + <u> 1 </u> = <u>2(3+y)+3-y </u>=
9-6y+y² 9-y² (3-y)² (3-y)(3+y) (3-y)²(3+y)
= <u>6 +2y+3-y </u>= <u> 9+y </u>
(3-y)²(3+y) (3-y)²(3+y)
2) (y-3)² * <u> 9+y </u> = <u>(-1(3-y))² * (9+y) </u> = <u>(-1)² (3-y)² (9+y)</u> =
(3-y)²(3+y) (3-y)²(3+y) (3-y)²(3+y)
= <u>9+y</u>
3+y
3)<u> 2y </u>+ <u> 9+y </u>= <u>2y+9+y </u>=<u> 9+3y </u>= <u>3(3+y) </u>= 3
y+3 3+y y+3 y+3 y+3
1)(a-b)²(1-3a+3b)
2)(m+n)³-(m+n)²=(m+n)²(m+n-1)
3)(x+y)²(x+y+2x)=(x+y)²(3x+y)
4)(x-2y)²-(x-2y)³=(x-2y)²(1-x+2y)