Question

calcule o valor da expressão sen120+cos150-sen330? heeelllpppp :)

Answer 1

$sen(120^o)=sen(60^o)=\frac{\sqrt3}{2}\\ \\ cos(150^o)=-cos(30^o)=-\frac{\sqrt3}{2}\\ \\ sen(330^o)=-sen(30^o)=-\frac{1}{2}\\ \\ sen(120^o)+cos(150^o)-sen(330^o)=\frac{\sqrt3}{2}-\frac{\sqrt3}{2}+\frac{1}{2}=\frac{1}{2}$