Cos²a(π-a)/1-cos(3π/2-a) = cos²a/1+sin a = 1-sin²a/1+sin a
если sin a = 3/5, то
1-(3/5)² / 1+3/5 = 1-9/25 / 1+3/5 = 16/25 / 8/5 = 16*5/25*8 = 2/5 = 0,4
<span>х^2=(х-6)^2+(х-3)^2</span>
x²=x²-12x+36+x²-6x+9
<span>x</span>²-18x+45=0
<span>D=324-4*45=144=12</span>²
<span>x1=(18+12)/2=15
x2=(18-12)/2=3
</span>
1-1
2-1
3-1
4-не знаю чет
5-1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-9t³(2t⁸-3k)+5(4t¹¹-3k) = -18t¹¹+27t³k+20t¹¹-15k = 2t¹¹+27t³k-15k