Parameters
* `x`: [floating value](@ref eve::floating_value). * `c`: [Conditional expression](@ref eve::conditional_expr) masking the operation. * `m`: [Logical value](@ref eve::logical_value) masking the operation.
Return value 1 .The computation returns a tuple-like whose elements are sinpi(x) and cospi(x)
sinpi(x)
cospi(x)