proof that sin120^@cos150^@-cos240^@sin...

proof that `sin120^@cos150^@-cos240^@sin330^@= -1`

Verified by Experts

`sin(90+30)cos(90+60)-cos(180+60)sin(360-30)`
`cos30*-sin60+cos60*-30`
`sqrt3/2*-sqrt3/2-1/2*1/2`
`-3/4-1/4`
`-1`
option 2 is correct.

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