Find the value of sin 330.cos 120+cos 210.sin 300?
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sin330=-sin30
cos120=-cos60
cos210=-cos30
sin300=-sin60
Using these values
(1/2)(1/2)+(√3/2)(√3/2)
1/4+3/4=1
cos120=-cos60
cos210=-cos30
sin300=-sin60
Using these values
(1/2)(1/2)+(√3/2)(√3/2)
1/4+3/4=1
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