Question 1100744
{{{x=(cot(A)+cos(A))}}}
{{{x^2=cot^2(A)+2cot(A)*cos(A)+cos^2(A)}}}
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{{{y=(cot(A)-cos(A))}}}
{{{y^2=cot^2(A)-2cot(A)*cos(A)+cos^2(A)}}}
So,
{{{x^2-y^2=4cot(A)*cos(A)}}}