The solution of the equation cos^2theta+...

The solution of the equation `cos^2theta+sintheta+1=0` lies in the interval

A

(a) `(-(pi)/(4),(pi)/(4))`

B

(b) `((pi)/(4),(3pi)/(4))`

C

(c) `((3pi)/(4),(5pi)/(4))`

D

(d) `((5pi)/(4),(7pi)/(4))`

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The correct Answer is:

D

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