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If the line ycos∅=xsin∅+acos∅ be a tangent to the circle x^2+y^2=a^2

If the line ycos∅=xsin∅+acos∅ be a tangent to the circle x^2+y^2=a^2 then: A) sin^2∅=1 B) sin^2∅=a^2 C) cos^2∅=1 D) cos^2∅=a^2 How the answer is C?

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