Cevap:
a) log3(x(x-2)=log3(15)
x(x-2)=15 burdan x=5 olur
b) cosx=a olsun
2a^2 - 1+a=0
2a^2 +a-1=0
(2a-1)(a+1)=0 burdan cosx=-1 ve cosx=1/2 ise
x=60 ve x=180
