Answer:
4 d
Step-by-step explanation:
Given D is mid-point of BC and AD⊥AC
From right angle △DAC
cosC=
a/2
b
=
a
2b
...(i)
also from cosine formulae
2ab
2
+b
−c
...(ii)
From (i) and (ii) we get
⇒4b
=a
⇒b
3
∴cosAcosC=
2bc
+c
−a
.
ca
[(
)+c
]
(
c
)
D
x is less than or equal to -3
I hope I was fast enough ^^
the answer should be 8..
Smaller is 18 and larger be 30