Sin^4x/a +sin^4x/b = 1/ a+b then show that sin^8x/a^3 +sin^8x/b^3 = 1/

1.	Sin^4x/a +sin^4x/b = 1/ a+b then show that sin^8x/a^3 +sin^8x/b^3 = 1/(a+b)^3
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