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Basic trigonometric identities. The formula for calculating sine A, cosine A, tangent A, cotangent A. Right-angled triangle. Education, school programs. Higher mathematics. Handwritten math text. 8561502 Vector Art at Vecteezy
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Find the equation of common tangent to circle `x^2 + y^2 = 5` and ellipse `x^2 + 9y^2 = 9`. - YouTube
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