cos480°sin150° + sin600°cos390°
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cos480 deg sin150 deg + sin 600 deg cos 390 deg
cos(360°+120°)sin(180-30)+sin(2*360-120)cos((360+30)
cos120sin30-sin120cos30
-cos60sin30-sin(180-60)cos30
-cos60sin30-sin60cos30
_(sin30cos60+sin60cos30)
-sin(30+60)
-sin90
= -1
Hope this helps you out.
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