Simplify 1140 degrees cos 390 degrees - cos 780 degrees sin 750 degrees .
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sin(360+780)cos(360+30)-cos(360+420)sin(360+390)
sin(780)cos(30)-cos(420)sin(390)
sin(360+420)cos(30)- cos(360+60)sin(360+30)
sin(420)cos(30)-(cos60)(sin30)
sin(360+60)cos(30)-cos(60)sin(30)
(sin60)(cos30)-(cos60)(sin30)
3\4-1\4
2\4
1\4
sin(780)cos(30)-cos(420)sin(390)
sin(360+420)cos(30)- cos(360+60)sin(360+30)
sin(420)cos(30)-(cos60)(sin30)
sin(360+60)cos(30)-cos(60)sin(30)
(sin60)(cos30)-(cos60)(sin30)
3\4-1\4
2\4
1\4
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