More familiar, however, are formulas that calculate f(2x) to be 2*f(x)^2 – 1, and that the secant is its reciprocal.
The real part of e^iθ (e to the i times theta), it is equal to its own fourth derivative, and the additive inverse of its second derivative. More familiar, however, are formulas that calculate f(2x) to be 2*f(x)^2 – 1, and that the secant is its reciprocal. For 10 points, identify this basic trigonometric function, equal to the adjacent over the hypotenuse.
The real part of e^iθ (e to the i times theta), it is equal to its own fourth derivative, and the additive inverse of its second derivative.
{cosine}