`sin/cos` for `BigFloat`

[baggepinnen]

julia> NaNMath.sin(big(1.0))
ERROR: MethodError: no method matching sin(::BigFloat)
You may have intended to import Base.sin
This error has been manually thrown, explicitly, so the method may exist but be intentionally marked as unimplemented.

Presumably all functions in

(:sin, :cos, :tan, :asin, :acos, :acosh, :atanh,
          :log, :log2, :log10, :log1p, :lgamma)

will fail like this

@oscardssmith