[" 19.If "(sin^(4)phi)/(a)+(cos^(4)phi)/...

[" 19.If "(sin^(4)phi)/(a)+(cos^(4)phi)/(b)=(1)/(a+b)," then prove that "(sin^(8)phi)/(a^(3))+(cos^(8)phi)/(b^(3))=(1)/((a+b)^(3))],[" 20.Prove that "(cot^(2)A(sec A-1))/(cot^(2)A(sec A-1))=sec^(2)A((1-sin A)/(1+sin A))]

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