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2. Trigonometric functions - Wikipedia

   en.wikipedia.org/wiki/Trigonometric_functions

   The other four trigonometric functions (tan, cot, sec, csc) can be defined as quotients and reciprocals of sin and cos, except where zero occurs in the denominator. It can be proved, for real arguments, that these definitions coincide with elementary geometric definitions if the argument is regarded as an angle given in radians . [ 6 ]

3. Small-angle approximation - Wikipedia

   en.wikipedia.org/wiki/Small-angle_approximation

   The small-angle approximations can be used to approximate the values of the main trigonometric functions, provided that the angle in question is small and is measured in radians : These approximations have a wide range of uses in branches of physics and engineering, including mechanics, electromagnetism, optics, cartography, astronomy, and ...

4. Law of tangents - Wikipedia

   en.wikipedia.org/wiki/Law_of_tangents

   Trigonometry. In trigonometry, the law of tangents or tangent rule [1] is a statement about the relationship between the tangents of two angles of a triangle and the lengths of the opposing sides. In Figure 1, a, b, and c are the lengths of the three sides of the triangle, and α, β, and γ are the angles opposite those three respective sides.

5. Tang Chao (physicist) - Wikipedia

   en.wikipedia.org/wiki/Tang_Chao_(physicist)

   His current research interest is at the interface between physics and biology. Specifically, he focuses on systems biology and works on problems such as protein folding, cell cycle regulation, function-topology relationship in biological network, cell fate determination and design principles in biological systems.

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   Our editors have hand-picked deals worth shopping from all our favorite retailers. The best of Kohl's Black Friday deals includes free shipping and an extra 15% off almost everything! Including a ...