Question

1. The discriminant of (x^2 - 5x - 1)^1/2 is?/
A. 21 B. 23 C.27 D.45

2. The value of cos 36 * cos 54 - sin 36 * sin 54 =
A. 1 B. 0 C. 2 D. -1

Answer 1

heyy nice question I don't know 1st one but can answer second one