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2. Tax Deduction and Collection Account Number - Wikipedia

   en.wikipedia.org/wiki/Tax_Deduction_and...

   A TAN application should accompany a 'proof of identity' and a 'proof of address' (photocopies) of the deductor. In the case of online applications, these documents need to be sent over mail (post/courier) to NSDL - TAN Application division. When NSDL receives the TAN application along with said documents (either through TIN FC / Online), the ...

3. Transaction authentication number - Wikipedia

   en.wikipedia.org/wiki/Transaction_authentication...

   A transaction authentication number (TAN) is used by some online banking services as a form of single use one-time passwords (OTPs) to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password authentication. TANs provide additional security because they act as a form of two-factor ...

4. Law of tangents - Wikipedia

   en.wikipedia.org/wiki/Law_of_tangents

   v. t. e. 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. Exact trigonometric values - Wikipedia

   en.wikipedia.org/wiki/Exact_trigonometric_values

   The trigonometric functions of angles that are multiples of 15°, 18°, or 22.5° have simple algebraic values. These values are listed in the following table for angles from 0° to 45°. [1] In the table below, the label "Undefined" represents a ratio If the codomain of the trigonometric functions is taken to be the real numbers these entries ...

6. Dielectric loss - Wikipedia

   en.wikipedia.org/wiki/Dielectric_loss

   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). Both refer to the phasor in the complex plane whose real and imaginary parts are ...

7. Tangent half-angle formula - Wikipedia

   en.wikipedia.org/wiki/Tangent_half-angle_formula

   The angle between the horizontal line and the shown diagonal is ⁠ 1 2 ⁠ (a + b). This is a geometric way to prove the particular tangent half-angle formula that says tan ⁠ 1 2 ⁠ (a + b) = (sin a + sin b) / (cos a + cos b). The formulae sin ⁠ 1 2 ⁠(a + b) and cos ⁠ 1 2 ⁠(a + b) are the ratios of the actual distances to the length ...

8. List of trigonometric identities - Wikipedia

   en.wikipedia.org/wiki/List_of_trigonometric...

   These identities are useful whenever expressions involving trigonometric functions need to be simplified. An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity.

9. Tangent half-angle substitution - Wikipedia

   en.wikipedia.org/wiki/Tangent_half-angle...

   Miscellanea. v. t. e. In integral calculus, the tangent half-angle substitution is a change of variables used for evaluating integrals, which converts a rational function of trigonometric functions of into an ordinary rational function of by setting . This is the one-dimensional stereographic projection of the unit circle parametrized by angle ...