sin780sin120+cos240sin390
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sin780.sin120+cos240.sin390
=sin(8x90+60).sin(90+30) +cos(3x90-30).sin(4x90+30)
=sin60.cos30+[-sin30].sin30
=sin60.cos30 - sin30.sin30
=(root3)/2 x (root3)/2 -1/2 x1/2
=3/4 -1/4
=2/4
=1/2
Hope this helps
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