-2a^3(-5a^2b)^2=-2а³ (5а²b)²=-2a³*25a⁴b²=-50a⁷b²
<span>4 (у+2)=-2
4y+8</span><span>=-2
4y</span><span>=-2-8
4y</span><span>=-10
y</span><span>=-10/4
y</span>=-5/2<span>=-2,5</span>
5х=16+8/2
5х=16 8/2
x=16 8/2 :5=4
Cosx=4/√17
sinx=-√(1-cos²x)=-√(1-16/17)=-1/√17
tgx=sinx/cosx=-1/√17:4/√17=1/√17*√17/4=-1/4