Что нибудь!!!!! плиз

2.
$9 x^{2} +16 y^{2} =144 \\ \frac{9 x^{2} }{144} + \frac{16 y^{2} }{144}=1 \\ \frac{ x^{2} }{16} + \frac{ y^{2} }{9} =1$

c²=a²-b²=16-9=7
c=√7

ε=c/a=√7/4

3.
z₁=1-3i
z₂=2+4i

z₁*z₂=(1-3i)(2+4i)=2+4i-6i-12i²=14-2i

4.
$\int {15 x^{2} + \frac{2}{sin ^{2}x } -e^{x} } \, dx = \int {15 x^{2} } \, dx + \int { \frac{2}{sin ^{2}x } } \, dx - \int {e ^{x} } \, dx =$
$=5 x^{3} -2ctgx-e ^{x} + C$