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If sec(phi+alpha)+sec(phi-alpha)=2sec ph...

If `sec(phi+alpha)+sec(phi-alpha)=2sec phi,` prove that `cos phi= +- sqrt2 cos alpha/2`

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If x=sec phi-tan phi and y=cos ec phi+cot phi, then

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(sec phi-tan phi)^2 (1+sin phi)^2 div sin^2 phi =?