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  2. 137 (number) - Wikipedia

    en.wikipedia.org/wiki/137_(number)

    137 is: . the 33rd prime number; the next is 139, with which it comprises a twin prime, and thus 137 is a Chen prime. [1]an Eisenstein prime with no imaginary part and a real part of the form .

  3. Trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_functions

    Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.