Trigonometric and Related Functions

  sin theta [function]

• theta is a float representing angle by radian. returns sin(theta).

  cos theta [function]

• theta is a float representing angle by radian. returns cos(theta).

  tan theta [function]

• theta is a float representing angle by radian. returns tan(theta).

  sinh x [function]

• hyperbolic sine, that is, .

  cosh x [function]

• hyperbolic cosine, that is, .

  tanh x [function]

• hyperbolic tangent, that is, .

  asin number [function]

• arc sine of number.

  acos number [function]

• arc cosine of number.

  atan y &optional x [function]

• When atan is called with one argument, its arctangent is calculated. When called with two arguments, atan(y/x) is returned.

  asinh x [function]

• hyperbolic arc sine.

  acosh x [function]

• hyperbolic arc cosine.

  atanh x [function]

• hyperbolic arc tangent.

  sqrt number [function]

• returns square root of number.

  log number [function]

• returns natural logarithm of number.

  exp x [function]

• returns exponential, .

  expt a x [function]

• returns xth power to a.