answersLogoWhite

0

sin(3A) = sin(2A + A) = sin(2A)*cos(A) + cos(2A)*sin(A)= sin(A+A)*cos(A) + cos(A+A)*sin(A)

= 2*sin(A)*cos(A)*cos(A) + {cos^2(A) - sin^2(A)}*sin(A)

= 2*sin(A)*cos^2(A) + sin(a)*cos^2(A) - sin^3(A)

= 3*sin(A)*cos^2(A) - sin^3(A)

User Avatar

Wiki User

10y ago

What else can I help you with?