Sin83⁰Cos52⁰ + Cos83⁰Sin52⁰ = Sin(83⁰ + 52⁰) = Sin135⁰ =
= Sin(180⁰ - 45⁰) = Sin45⁰ = √2/2
sin83cos52+cos83sin52=sin(83+52)=sin135
(Сам пример )
5x^2 + x=0
x * (5x+1)=0
x=0 или 5x+1=0
x= - 1/5 ( это дробь)
S=ahₐ=bh₅
S=6×8=48см²
h₅=S/b=48/10=4,8см