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[" 17."cos(270^(@)+theta)cos(90^(@)-theta)-sin(270^(@)-theta)cos theta=...],[[" (A) "0," (B) "-1," (C) "0.5]]

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

sin(270^(@)-theta).sin(90^(@)-theta)-cos(270^(@)-theta).cos(90^(@)+theta)=

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sin theta cos(90^(@)-theta)+cos theta sin(90^(@)-theta)

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

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

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