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[" 19.Show that "],[qquad [sec^(3)theta-...

[" 19.Show that "],[qquad [sec^(3)theta-cosec^(3)theta],[" 20.If "sin theta+sin^(2)theta+sin^(3)theta=1" ,prove that "cos^(6)theta-4cos^(4)theta+8cos^(2)theta=4" ."]]

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