Question

（√5+1/2）^2 ×（√ 5-1/2） ^2

Answer 1

=[(√5+1)(√5-1)/4]²
=[(5-1)/4]²
=1²
=1

Answer 2

=x²-(y²+2y+1)
=x²-(y+1)²
=(x+y+1)(x-y-1)
选A
原式=[(a+b)-1]²
=(a+b-1)²
奇函数则f(0)=0
所以cosb=0
b=kπ+π/2