If sin 4theta/a + cos 4theta/b = 1/a+b,then prove that sin 8theta/a3 + cos 8 theta /b3=1/(a+b)3.

If sin 4theta/a + cos 4theta/b = 1/a+b,then prove that sin 8theta/a3 +

1.	If sin 4theta/a + cos 4theta/b = 1/a+b,then prove that sin 8theta/a3 + cos 8 theta /b3=1/(a+b)3.
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