[" If "Sec(theta+alpha)+Sec(theta-alpha)...

[" If "Sec(theta+alpha)+Sec(theta-alpha)=2Sec theta" and "],[" Cos "alpha!=1" ,then "Cos theta=],[" (A) "sqrt(2)cos(alpha)/(2)],[" (B) "-sqrt(2)cos(alpha)/(2)],[" (c) "+-sqrt(2)cos(alpha)/(2)],[" (D) "+-sqrt(2)sin(alpha)/(2)]

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