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Questions  

One root of the equation cosxx+12=0 lies in the interval

a
0,π2
b
−π2,0
c
π2,π
d
π,3π2

detailed solution

Correct option is A

Let f(x)=cosx−x+12We can see that f(0)>0,fπ2<0⇒fx=0 has atleast one root in 0,π2

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