Alternative print statements

Desired output:
Hello, World! sin(3.4)=-0.255541102027
String concatenation:
print "Hello, World! sin(" + str(r) + ")=" + str(s)
printf-like statement:
print "Hello, World! sin(%g)=%g" % (r,s)
Variable interpolation:
print "Hello, World! sin(%(r)g)=%(s)g" % vars()

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