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  2. Tax Deduction and Collection Account Number - Wikipedia

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

    Failure to apply for TAN or not quoting the same in the specified documents attracts a penalty of ₹10,000 No documents are required to be filed with the application for allotment of TAN. However, where the application is online, the acknowledgment (a PDF file) which is generated after filling up the form must be forwarded to NSDL.

  3. List of trigonometric identities - Wikipedia

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

    Trigonometric functions and their reciprocals on the unit circle. All of the right-angled triangles are similar, i.e. the ratios between their corresponding sides are the same. For sin, cos and tan the unit-length radius forms the hypotenuse of the triangle that defines them.

  4. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    Repeated application of the half-angle formulas leads to nested radicals, specifically nested square roots of 2 of the form . In general, the sine and cosine of most angles of the form β / 2 n {\displaystyle \beta /2^{n}} can be expressed using nested square roots of 2 in terms of β {\displaystyle \beta } .

  5. United States Uniformed Services Privilege and Identification ...

    en.wikipedia.org/wiki/United_States_Uniformed...

    The DD Form 2, DD Form 2765, and DD Form 1173 ID\S cards are color-coded to denote the status of the holder. [5] Colors include: Tan (DD FORM 2765) - Tan identification card recipients are afforded multiple privileges. Recipients include gold-star (surviving) parents and dependents, Medal of Honor recipients, prisoners of war (current and ...

  6. Pythagorean trigonometric identity - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_trigonometric...

    Similar right triangles illustrating the tangent and secant trigonometric functions Trigonometric functions and their reciprocals on the unit circle. The Pythagorean theorem applied to the blue triangle shows the identity 1 + cot 2 θ = csc 2 θ, and applied to the red triangle shows that 1 + tan 2 θ = sec 2 θ.

  7. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Many texts write φ = tan −1 ⁠ y / x ⁠ instead of φ = atan2(y, x), but the first equation needs adjustment when x ≤ 0. This is because for any real x and y, not both zero, the angles of the vectors (x, y) and (−x, −y) differ by π radians, but have the identical value of tan φ = ⁠ y / x ⁠.

  8. Total acid number - Wikipedia

    en.wikipedia.org/wiki/Total_Acid_Number

    The total acid number (TAN) is a measurement of acidity that is determined by the amount of potassium hydroxide in milligrams that is needed to neutralize the acids in one gram of oil. [1] It is an important quality measurement of crude oil. The TAN value indicates to the crude oil refinery the potential of corrosion problems.

  9. List of mathematical abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical...

    tan – tangent function. (Also written as tgn, tg.) tanh – hyperbolic tangent function. TFAE – the following are equivalent. tg – tangent function. (Also written as tan, tgn.) tgn – tangent function. (Also written as tan, tg.) Thm – theorem. Tor – Tor functor. Tr – field trace. tr – trace of a matrix or linear transformation ...