作业帮sin^2(10)+cos^2(40)+sin10cos40
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sin^2(10)+cos^2(40)+sin10cos40
sin^2(10)+cos^2(40)+sin10cos40
sin^2(10)+cos^2(40)+sin10cos40
sin^2(10)+cos^2(40)+sin10cos40
=(1-cos20)/2+(1+cos80)/2+1/2(sin50-sin30)
=1+1/2(cos80-cos20)+1/2sin50-1/4
=3/4-1/2sin50+1/2sin50
=3/4
0.75