tg(3π/2+a)sin(2π-a) =
= - сtg a · (-sin a) =
= cos a ·sin a:sin a = cos a
1. 32*4= 128 (т) - необходимо выпить в течении 32 дней
X²<span>-3x-40=0
d = b</span>² -4ac = 9 - 4 * (-40) = 9 + 160 = 169
√d = √169 = 13
<u>x₁</u> = ( -b + √d ) / 2a = ( 3 + 13 ) / 2 = 16 / 2 = 8
<u>x₂</u> = ( -b - √d ) / 2a = ( 3 - 13 ) / 2 = -10 / 2 = -5