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#### 12.2.20 sin, cos, tan [Function]

`sin` radians ⇒ number

`cos` radians ⇒ number

`tan` radians ⇒ number

#### Arguments and Values::

radians—a number given in radians.

number—a number.

#### Description::

sin, cos, and tan return the sine, cosine, and tangent, respectively, of radians.

#### Examples::

     (sin 0) ⇒  0.0
     (cos 0.7853982) ⇒  0.707107
     (tan #c(0 1)) ⇒  #C(0.0 0.761594)

#### Exceptional Situations::

Should signal an error of type type-error if radians is not a number. Might signal arithmetic-error.

#### See Also::

asin , acos, atan, Rule of Float Substitutability