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How you prove that sin(90+30)=cos30?
Hello world!
May 27, 2020CRITICAL THINKING ABOUT THE BIBLE
January 5, 2021You need the identity
##sin(a+b)=sin(a)cos(b)+cos(a)sin(b)##
Just plugging in the numbers
##sin(90+30)=sin(90)cos(30)+cos(90)sin(30)=cos(30)##
Since ##sin(90)=1## and ##cos(90)=0##
