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Find sin330^@.cos120^@+ cos210^@.sin300^...

Find `sin330^@.cos120^@+ cos210^@.sin300^@`

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Find the value of sin330^(@)cos120^(@)+cos210^(@)sin300^(@)

Find the value of sin 330^(@) .cos 120^(@) + cos 210^(@) . Sin 300^(@) .

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)=

Prove that sin120^@ cos330^@ +cos240^@ sin330^@=1

Prove that: sin 150^@ cos 120^@+ cos 330^@ sin 660^@= - 1 .

What is the value of Sin420^@.cos390^@ + cos(-300^@). sin(-330^@ )?