Question

Sa se calculeze sin la adoua de 150 de grade + cos la adoua de 60 de grade .

Answer 1

Sin 150 = sin(90+60)= sin90cos60+cos90sin60. Sin 90 = 1 si cos 90 e 0 => sin 150 e cos 60 care e sin (90-60) = sin 30 =1/2. Deci pt exercitiul tau avem (1/2)^2+(1/2)^2=1/4+1/4=2/4=1/2