Question

The range for the function 5 -3 cos x if X ϵ R is: 
a) (2, ∞)

b) (-∞, 8)

c) [5, 0]

d) [2, 8]

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Answer 1

Answer:

Correct option is

A

(−∞,∞)

f(x)=

2x

2

−8x−3x+12

e

x

lnx(x

2

+2)(x

2

−5x−2x+10)

=

(2x−3)(x−4)

e

x

lnx(x

2

+2)(x−2)(x−5)

∵domain=R−{

2

3

,4}.

But f(x) in defend for all value of x as per the group of f(x).

Hence Range of f(x)=(−∞,∞).

Answer 2

Don't know the answer