1 .	If cos A = tan B, cos B = tan C and cos C = tan A then $sin^2$ A is equal to a.$\sqrt{2}-1\over4$ , b.$\sqrt{2}-1\over2$ , c.$\sqrt{3}-1\over4$ , d.$3-\sqrt{5}\over2$
[ A ]    a [ B ]    b [ C ]    c [ D ]    d
Answer : Option D Explanation :
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