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Prove that (cos(90^(@)+theta)sec(270^(@)...

Prove that `(cos(90^(@)+theta)sec(270^(@)+theta)sin(180^(@)+theta))/(cosec(-theta)cos(270^(@)-theta)tan(180^(@)+theta))`

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The value of cos (270^(@) + theta) cos ( 90^(@) -theta) -sin (270^(@) - theta) cos theta is