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How do you use the sum and difference formula to simplify sin20cos80-cos20sin80?
Hello world!
May 27, 2020CRITICAL THINKING ABOUT THE BIBLE
January 5, 2021This formula can be simplified to ##-sin60=-sqrt(3)/2##
##sin20cos80-cos20sin80=sin(20-80)=sin(-60)=-sin60=-sqrt(3)/2##
