Question #31f83

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Answer 1 · 2015-05-14T15:56:49

You have #sin^2(30°)+cos^2(30°)=#
but:
#sin(30°)=1/2#
#cos(30°)=sqrt(3)/2#
so:
#=(1/2)^2+(sqrt(3)/2)^2=1/4+3/4=4/4=1#