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  2. List of trigonometric identities - Wikipedia

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

    When the direction of a Euclidean vector is represented by an angle , this is the angle determined by the free vector (starting at the origin) and the positive -unit vector. The same concept may also be applied to lines in a Euclidean space, where the angle is that determined by a parallel to the given line through the origin and the positive x ...

  3. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    In mathematics, the values of the trigonometric functions can be expressed approximately, as in ⁡ (/), or exactly, as in ⁡ (/) = /.While trigonometric tables contain many approximate values, the exact values for certain angles can be expressed by a combination of arithmetic operations and square roots.

  4. Tan-1 - Wikipedia

    en.wikipedia.org/wiki/Tan-1

    tan1 y = tan1 (x), sometimes interpreted as arctan(x) or arctangent of x, the compositional inverse of the trigonometric function tangent (see below for ambiguity) tan1 x = tan1 (x), sometimes interpreted as (tan(x)) −1 = ⁠ 1 / tan(x) ⁠ = cot(x) or cotangent of x, the multiplicative inverse (or reciprocal) of the ...

  5. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    The red section on the right, d, is the difference between the lengths of the hypotenuse, H, and the adjacent side, A.As is shown, H and A are almost the same length, meaning cos θ is close to 1 and ⁠ θ 2 / 2 ⁠ helps trim the red away.

  6. Trigonometry - Wikipedia

    en.wikipedia.org/wiki/Trigonometry

    Sumerian astronomers studied angle measure, using a division of circles into 360 degrees. [8] They, and later the Babylonians , studied the ratios of the sides of similar triangles and discovered some properties of these ratios but did not turn that into a systematic method for finding sides and angles of triangles.

  7. Sobbing and prayers echo through South Korean airport as ...

    www.aol.com/sobbing-prayers-echo-south-korean...

    The sounds of sobbing, prayers and anguish echoed through the departures hall of an airport in southwestern South Korea on Monday as families of the victims aboard a passenger jet that crash ...

  8. Browns fire OC Ken Dorsey after 3-14 season - AOL

    www.aol.com/reports-browns-fire-oc-ken-153813367...

    The Cleveland Browns fired Ken Dorsey on Sunday, parting ways with their second offensive coordinator in as many seasons. Offensive line coach Andy Dickerson also was let go by the team.

  9. Mnemonics in trigonometry - Wikipedia

    en.wikipedia.org/wiki/Mnemonics_in_trigonometry

    Write a 1 in the middle where the three triangles touch; Write the functions without "co" on the three left outer vertices (from top to bottom: sine, tangent, secant) Write the co-functions on the corresponding three right outer vertices (cosine, cotangent, cosecant) Starting at any vertex of the resulting hexagon:

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