cos76 cos76+cos16 cos16-
cos76 cos16
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cos76cos76+cos16cos16-cos76cos76
=cos^2 76+cos^2 16 -cos^2 76
=cos^2 76+sin^2(90-16)-cos^2 76
=cos^2 76+sin^2 76 -cos^2 76
=1 - cos^2 76
= sin^2 76
=cos^2 76+cos^2 16 -cos^2 76
=cos^2 76+sin^2(90-16)-cos^2 76
=cos^2 76+sin^2 76 -cos^2 76
=1 - cos^2 76
= sin^2 76
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