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sin 21 cos 9 – cos 84 cos 6 cos 66 + sin 84 in degrees
Multiplying it by 2 ,=2sin21°cos9° – 2cos84°cos6°=cos(21–9)°– cos(21+9)° – cos (84+6) –cos(84–6)=cos 12° – cos30° – cos90° – cos78°=cos(90–78)°–√3/2 – 0 – cos 78°=sin78° –0.87–cos 78°=0.97–0.87– 0.20=–0.1
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