Como calcular: sen40°.cos20°+ sen20°.cos40°?

Comments

• einstein

  June 2021

  sen(a+b)=sen a*cos b+sen b*cos a

  sen(40+20)=sen40°.cos20°+ sen20°.cos40°

  sen(40+20)=sen 60º=√3/2
• jarbas

  June 2021

  sen(40°+20°) = 0,866

  ====================
• anonymous

  June 2021

  calculadora casio