If cos theta=-(1)/(2) and piltthetalt(3p...

If `cos theta=-(1)/(2)` and `piltthetalt(3pi)/(2)`, then find the value of `4 tan^(2)theta-3cos ec^(2)theta`. Prove that, `cos 570^(@) sin510^(@)+sin(-330^(@))cos(-390^(@))=0`

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