Question

Find the domain of the following functions :

1/6x^2-x-1​

Answer 1

Answer:

f(x)=6+35x−6x2cosx−21

For f(x) to be defined cosx−21≥0

⇒x∈[−3π,3π]∪[35π,37π]

Also 6x2−35x−6<0⇒−61<x<6

Thus combining above two we get required domain ⇒x∈[−3π,3π]∪[35π,6)

Answer By Anushka

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