Prove that Sin750. Cos480+cos120.cos60= -1/2
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Answer:
sin750.cos480+cos120.cos60
sin(720+30).cos(360+120)+cos120.cos(90-30)
sin30.cos120+cos120.sin30
2×sin30 cos120
2×(1/2)×(-1/2)
= -1/2
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