zadania podaje w załaczniku. to bardzo pilne zadania......odpowiedz prosze w zalaczniku bo ciezko bedzie ja inaczej odczytac....dziękuję
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(1+sinα)(1-sinα)=cosα*sinα*cosα/sinα
1-sin²α=cosα*cosα
cos²α=cos²α
2.
cosα=√2/3
1-cos²=sin²
1-2/9=sin²
7/9=sin²
sin=√7/3 tg=sin/cos=√7/3*3/√2=√7/√2 ctg=cos/sin=√7/3*3/√2=√2/√7
3.
a=21 b=11 x=(a-b):2 x=5
h²=r²-x² h²=169-25 h=12
h²+(½a+a)²=a²
144+256=a² a=20
4.
-x³+2x²-x+5 - [ 2x²-x+1+3(5x+2)]=-x³+2x²-x+5 -(2x²-x+1+15x+6)=
-x³+2x²-x+5 -2x²-14x-7=-x³-15x-2
5.
x³-5x²-25x+125=x²(x-5)-25(x-5)=(x-5)(x²-25) x=5 x=-5
(7-x)(x+7)=(x-2)(x+3)
-x²+49=x²+x-6
2x²+x-55=0 Δ=1+440 √Δ=21 x=-1+21/4=5 x=-22/4=-5,5
6.D=R\{-3,3}
x+2/x²-6x+9 - x-2/x²-9
x+2/(x²-6x+9)(x+3)-x-2/(x²-9)(x-3)
x+2/x³-6x²+9x+3x²-18x+27=x-2/x³-9x-3x²+27
x+2/x³-3x²-9x+27-x-2/x³-9x-3x²+27
x+2-x+2/x³-9x-3x²+27=4/x³-9x-3x²+27