If cos40^(@)=xandcostheta=1-2x^(2), then...

If `cos40^(@)=xandcostheta=1-2x^(2)`, then the possible values
of `theta` lying between `0^(@)` and `360^(@)` is

A

(a) `100^(@)and260^(@)`

B

(b) `80^(@)and280^(@)`

C

(c) `280^(@)and110^(@)`

D

(d) `110^(@)and260^(@)`

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The correct Answer is:

A

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