in triangle ABC,AB=X,AC=7 and angle B =90 degree
evaluate root 7-x.tan C+cot A-14 cos A+21 sin C+root 49+x^2.cosb
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https://www.meritnation.com/ask-answer/question/in-triangle-abc-c-90-ab-x-units-and-ac-3-unitsevaluvate-x/introduction-to-trigonometry/8361395
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