Question

Cine ma ajuta si pe mine?Dau coronita...sincer eu am incercat sa le fac,dar nu stiu daca e bun

Answer 1

1.

d:4x+2y+5=0

m=-a/b=-4/2=-2

d||d'=>m=m'=-2

d':y-yA=m'(x-xA)<=>d':y-1=-2x+2<=>d':2x+y-3=0

2.

sin(180°-x)=sinx

sin(180°-130°)=sin130°<=>sin50°=sin130°

sin^2x+cos^2x=1 (formula fundamentala a trigonometriei)

sin^2 130°+cos^2 50°=sin^2 50°+ cos^2 50°=1