Question

Вычислить sin(arccos(-4/5)) хелп

Answer 1

sin(arccos(-4/5))=sin(π-arccos(4/5))=sin(arccos(4/5))=√(1-cos²(arccos4/5))=√(1-(4/5)²)=√(1-16/25)=√(9/25)=3/5