Помогите
[tex]5(cos 430 * sin 400 - sin 130 cos740)[/tex]

5(cos430sin400-sin130cos740)==5(cos(360+70)sin(360+40)-sin(180-50)cos(720+20))==5(cos70sin40-sin50cos20)==5(cos(90-20)sin(90-50)-sin50cos20)==5(sin20cos50-sin50cos20)==5(sin(20-50))==5(sin(-30))==-5sin30==-5*1/2==-2,5