Question

2sin7π/12 sinπ/12=?
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Answer 1

Answer:+1/2

Step-by-step explanation:

2sin7π/12*sinπ/12

2sinAsinB=cos(A-B)-cos(A+B)

=cos(7π/12-π/12)-cos(7π/12+π/12)

=cos(6π/12)-cos(8π/12)

=cos(π/2)-cos(2π/3)

=cos(90°)-cos(120°)

=0-(-1/2)

=1/2