यदि `4 sin alpha cos alpha - 8 sin^(3) alpha cos alpha = (sqrt(3))/(2)` तथा `8 cos^(4) alpha - 8 cos^(2) alpha + 1 = (-1)/(2)` है, जहाँ `alpha in (0, (pi)/(2))` है, तो `log_("cos"(alpha)/(2))((sin alpha + cos alpha)/(sqrt(2)))` का मान है: (i) 0 ; (ii) 1 ; (iii) 2 ; (iv) 3

Options

A. 0
B. 1
C. 2
D. 3

Answer

B