With Gordon, this function names a partial differential equation with soliton solutions.
With Gordon, this function names a partial differential equation with soliton solutions. Euler solved the Basel problem using its series expansion, which only has odd powers. For small angles, this function can be approximated by y = x. Its namesake law equates the ratios between this function of an angle and the length of the opposite side in a triangle. This function is positive in the first and second quadrants, and corresponds to the y-coordinate on a unit circle. This reciprocal of cosecant is defined in a right triangle as "opposite over hypotenuse." For 10 points, name this trigonometric function often paired with cosine.
With Gordon, this function names a partial differential equation with soliton solutions.
sine [accept sine of x, sine of theta, etc.] 