What will come in the place of question mark (?) in the

Find the value of 3/4 cot² 30° + cos² 30°-3cosec²60° + tan² 60°.

If √y + (1/√y) = 10, then find the value of y + (1/y).

x + y = 4, xy = 2, y + z = 5, yz = 3, z + x = 6 and xz =4, then find the value of x ³  + y ³  + z ³  – 3xyz.

if 2^x +3^y =7 and 2^x+2 -3^y+2 =7, then find the value of x and y.

If x + y + z = 6, and x³ + y³ + z³ = 36, xyz = 6 then find (xy +yz + zx)?

If a² + c² + 17 = 2(a - 8b - 2c²), then what is the value of (a³ + b³ + c³)?

The area of △ ABC is 44 cm² . If D is the midpoint of BC and E is the midpoint of AB, then the area of △ BDE is