0.5-cos^2(π/8)
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0.5-cos^2(π/8)0.5-cos^2(π/8)0.5-cos^2(π/8)0.5-cos^2(π/8)=0.5-(cosπ/4+1)/2=0.5-cosπ/4/2-1/2=-√2/2/2=-
0.5-cos^2(π/8)
0.5-cos^2(π/8)
0.5-cos^2(π/8)
0.5-cos^2(π/8)
=0.5-(cosπ/4+1)/2
=0.5-cosπ/4/2-1/2
=-√2/2/2
=-√2/4;
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cos2A=2cos²A-1
0.5-cos^2(π/8)
=1/2[1-2cos^2(π/8)]
=1/2[-cos(2*π/8)]
=-1/2cos(π/4)
=-√2/4
0.5-cos^2(π/8)
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