
Mark M. answered 02/16/21
Mathematics Teacher - NCLB Highly Qualified
-5π / 12 = -3π / 12 + (-2π / 12)
-5π / 12 = -π/4 + (-π/6)
For example
sin (-5π / 12) = sin (-π/4 + (-π/6))
sin (-π/4 + (-π/6)) = sin -π/4 cos -π/6 + cos -π/4 sin -π/6
Can you complete this one and the others and answer?