Prove that sin750°cos480°+cos120°cos60°=1/2
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I think this will help you.
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Step-by-step explanation:
sin (2×360+30) cos((360+90)+30) +cos (180-120)cos60
=sin 30 cos(-30) +cos(-60) cos60
=(1/2) (-1/2) +(-1/2) (1/2)
=-1/4-1/4
=-1/2
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