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2. Small-angle approximation - Wikipedia

   en.wikipedia.org/wiki/Small-angle_approximation

   These approximations have a wide range of uses in branches of physics and engineering, including mechanics, electromagnetism, optics, cartography, astronomy, and computer science. [ 1 ] [ 2 ] One reason for this is that they can greatly simplify differential equations that do not need to be answered with absolute precision.

3. Dielectric loss - Wikipedia

   en.wikipedia.org/wiki/Dielectric_loss

   In electrical engineering, dielectric loss quantifies a dielectric material's inherent dissipation of electromagnetic energy (e.g. heat). [1] It can be parameterized in terms of either the loss angle δ or the corresponding loss tangent tan(δ).

4. Law of tangents - Wikipedia

   en.wikipedia.org/wiki/Law_of_tangents

   To prove the law of tangents one can start with the law of sines: ⁡ = ⁡ =, where ⁠ ⁠ is the diameter of the circumcircle, so that ⁠ = ⁡ ⁠ and ⁠ = ⁡ ⁠.. It follows that

5. Dianna Cowern - Wikipedia

   en.wikipedia.org/wiki/Dianna_Cowern

   Dianna Leilani Cowern (born May 4, 1989) is an American science communicator.She is a YouTuber; she uploads videos to her YouTube channel Physics Girl explaining various physical phenomena.

6. Dissipation factor - Wikipedia

   en.wikipedia.org/wiki/Dissipation_factor

   In physics, the dissipation factor (DF) is a measure of loss-rate of energy of a mode of oscillation (mechanical, electrical, or electromechanical) in a dissipative system. It is the reciprocal of quality factor, which represents the "quality" or durability of oscillation.

7. History of trigonometry - Wikipedia

   en.wikipedia.org/wiki/History_of_trigonometry

   To compensate for the lack of a table of chords, mathematicians of Aristarchus' time would sometimes use the statement that, in modern notation, sin α/sin β < α/β < tan α/tan β whenever 0° < β < α < 90°, now known as Aristarchus's inequality. [16]