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Function std.math.expi
On many CPUs (such as x86), this is a very efficient operation;
almost twice as fast as calculating sin(y) and cos(y) separately,
and is the preferred method when both are required.
Prototype
creal expi( real y ) pure nothrow @nogc @trusted;
Example
assert(expi(1.3e5L) == cos(1.3e5L) + sin(1.3e5L) * 1i); assert(expi(0.0L) == 1L + 0.0Li);
Authors
Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw