Question

: sin A
sin (60° - A). sin (60° + A) =​

Answer 1

Step-by-step explanation:

sinAsin(60+A)sin(60-A)

=sinA[sin²60-sin²A]

[since,sin(A+B)sin(A-B)=sin²A-sin²B]

=sinA(3/4-sin²A)

=3sinA/4-sin³A

=1/4[3sinA-4sin³A]

=1/4sin3A