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[" 6.If "alpha" and "p" are the solution...

[" 6.If "alpha" and "p" are the solutions of the equation atane+ bsec theta "=c" ,then show that "tan(alpha+beta)=(1)/(a)" a "],[" 7.Solve: "sqrt(3)cos theta+sin theta=sqrt(2)" ."],[" 8.Find the greatest value of "sin x cos x" ."],[" ( "" 9.Find the value of "cos(pi)/(5)cos(2 pi)/(5)cos(4 pi)/(5)cos(8 pi)/(5)]

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